10 Scottish Islands You Are Legally Forbidden to Visit — And the Dark Reasons Why

Added: 2026-05-31

[00:00:00]10 Scottish Islands exist that you cannot visit. Not because they're remote, not because the weather makes them dangerous, but because someone decided at some point in history that what happened there should never be seen. One of them was sprayed with one of the most lethal biological weapons ever created. On another, three men vanished without a trace in the middle of the night and nobody in over a hundred years has been able to explain how. On a third, a king locked two newborn babies on a deserted island as part of an experiment still studied in psychology textbooks today. I spent weeks going through military archives, historical records, and declassified government documents to bring you this documentary. And what I found goes beyond anything you've heard about Scotland before because these islands aren't legends. They're real places.

[00:00:52]Places where right now, today, it is forbidden to set foot. And the reasons they're sealed off are more disturbing than any ghost story anyone could have invented. Last island on this list has a history that governments have spent decades trying to keep out of the headlines.

[00:01:09]And when you hear it, you'll understand why. There's an island in the Firth of Forth that seems to mark them from the ferry crossing between Edinburgh and Fife looks like a warship run aground in the middle of the estuary. It's not an optical illusion. That's Inchmickery, a strip of land barely a hundred meters wide and two hundred meters long. So small you could walk the whole of it in three minutes. But what the British government built on top of it during two World Wars turned it into something that's still impossible to ignore today.

[00:01:42]During the First World War, the Admiralty identified the Firth of Forth as one of the most vulnerable points in the country. The estuary connected directly to the naval base at Rosyth where part of the British fleet was berthed. Any German submarine that managed to penetrate those waters could sink ships in harbor without firing a single torpedo in open sea. Inchmickery, sitting dead center in the estuary, was the perfect control point. Within months, the island was transformed into an artillery emplacement.

[00:02:14]Gun batteries went up, concrete bunkers, engine rooms, ammunition stores. By the Second World War, all of that had been expanded and reinforced. The result was a structure so dense and compact that from a distance the entire island looked like a battleship about to set sail.

[00:02:31]When the wars ended, the military left, but the structures stayed. Today Inchmickery is an RSPB reserve and access is controlled and restricted between May and August to protect the colonies of terns and eiders nesting among the same bunkers that once stored artillery shells. You need a permit to get on and most applications are refused. But what makes Inchmickery truly unsettling isn't the guns or the bunkers. It's what happened there centuries before the military arrived.

[00:03:01]Historical records suggest the island once held a religious settlement in medieval times, most most likely a community of Celtic monks. The island's Gaelic name, Isle of the Vicars. Nobody knows exactly what happened to that community. It disappeared and centuries later the island was taken over again, this time by the army and abandoned again. Today only the birds inhabit it and access permits are still being refused. But if Inchmickery keeps its secrets buried among its bunkers, the next island on this list keeps something far darker within its walls.

[00:03:38]Something a king decided to do with two babies and that nobody has been able to fully answer in over 500 years. 3 mi north of Edinburgh, in the middle of the Firth of Forth, there's an island that has served as a syphilis quarantine, a burial ground for Russian sailors, a military fortress, and the site of one of the most disturbing experiments any human being has ever ordered carried out. It's called Inchkeith.

[00:04:05]And although today it's officially abandoned and public access isn't authorized, its history weighs far heavier than its size. In 1497, the authorities in Edinburgh made a decision that reflects with surgical precision the kind of panic that grips a city when an epidemic strikes and no cure exists.

[00:04:24]Edinburgh was being devastated by what records of the time called the great contagious sickness, what we now know was syphilis. The solution was simple and brutal. Every infected person was to board a ship at the port of Leith and be transferred to Inchkeith. The orders were clear. They would remain there until God provided for their health.

[00:04:45]Historians estimate that most of them died on the island. In 1580, the same thing happened again with bubonic plague. In 1609, again. In 1799, Russian sailors who died of an unidentified disease were buried in its soil. But none of those episodes is the darkest in its history. The darkest happened in 1493, 4 years before the syphilis patients were sent there to die. King James the fourth of Scotland was a man fascinated by science and knowledge. He spoke at least six languages. He kept an alchemist at his court who on one occasion glued hen feathers to his arms and attempted to fly from Stirling Castle, landing in a dung heap and breaking his leg. The king, far from dismissing him, kept him on the payroll. That was the kind of man James the fourth was.

[00:05:35]One day, the king became obsessed with a question. What language would human beings speak if nobody taught them any?

[00:05:41]Does an innate language exist engraved in the soul from birth, the original tongue that God gave to Adam and Eve. To answer it, he devised an experiment. He ordered two newborn babies to be taken to Inchkeith, along with a mute woman who would act as their carer. The woman could not speak. The babies would hear no human language, and the king would wait for them to grow up to discover what tongue emerged from them naturally.

[00:06:08]The children remained on the island for years. When they were finally collected, historical records written a century later by the chronicler Robert Lindsay of Pitscottie claim that some at court insisted the children spoke perfect Hebrew. Modern historians are unanimous. That's impossible. What the children almost certainly developed was their own system of gestural communication, sounds they'd heard in nature, and an existence that no ethics committee anywhere in the world would approve today. Inchkeith continued to be used as a military base during the Second World War.

[00:06:44]Its final abandonment came in the 1980s when the lighthouse was automated.

[00:06:49]Today, the island belongs to a private entity. Access isn't authorized, and the only people who visit occasionally are researchers with specific permits. The military ruins are still standing, and somewhere on that island, under the grass that has grown over 500 years of history, lie the remains of those who didn't survive its quarantines. What you've just heard is what a king did to two children in the name of science.

[00:07:16]But on the next island, it was the British government itself that designed something colder still. Something carried out not with children, but with a weapon capable of killing hundreds of thousands of people. In 1942, in the middle of the Second World War, the British government purchased a small island off the northwest coast of Scotland for £500 sterling.

[00:07:39]The price was laughable. The objective, classified as a state secret for decades, was anything but. The island was called Gruinard, and what happened there between 1942 and 1943 turned it into one of the most dangerous places British soil has ever produced.

[00:07:57]Winston Churchill was convinced that Nazi Germany was developing biological weapons.

[00:08:03]To counter that threat or to get ahead of it, he ordered scientists at the Porton Down government laboratory to investigate the potential of anthrax as a weapon of war. Anthrax, caused by the bacterium Bacillus anthracis, is one of the most lethal biological weapons in existence. Its spores can remain viable in soil for decades. A single inhalation in sufficient quantity can kill a healthy adult within days, and it is practically invisible.

[00:08:31]arrived at Gruinard with a flock of sheep as test subjects and bombs loaded with anthrax spores. They detonated them over the animals. The sheep began dying within hours. What nobody had calculated with sufficient rigor was that the spores didn't stay on the island. The wind carried them. Sheep on the mainland, kilometers away, also died.

[00:08:53]The government covered it up. It paid compensation to affected farmers on the condition that they asked no questions.

[00:09:00]Gruinard was declared a forbidden zone.

[00:09:02]Signs hammered into the coastline warned that landing was both illegal and potentially fatal. The island remained contaminated for more than four decades.

[00:09:12]In 1979, government scientists detected viable anthrax spores across a 3-ha area of the island. The contamination had barely diminished in nearly 40 years. Public pressure grew. In 1981, a clandestine group calling itself the Dark Harvest Commando sent a letter to several media outlets announcing they had collected contaminated soil from Gruinard and deposited it at the Porton Down facilities, the same laboratory that had designed the experiment. The soil contained active anthrax.

[00:09:46]The government could no longer ignore it. Between 1986 and 1988, the British Army carried out a massive decontamination operation. They removed the upper layer of soil in the most affected areas and sprayed the entire island with 280 tons of formaldehyde solution diluted in seawater. They introduced test sheep to verify the contamination had ceased. In April 1990, a defense minister visited the island publicly and removed the danger signs. A week later, the government sold Gruinard for 500 pounds to the heirs of the original owner.

[00:10:23]The same price it had paid 48 years earlier.

[00:10:26]Today, Gruinard is technically accessible, but nobody's in a hurry to go.

[00:10:31]There's no infrastructure, no regular transport, and the island's reputation remains that of a place where the soil was deliberately poisoned by the government itself. Scientists confirmed the decontamination was effective, but anthrax spores can survive in the right conditions for hundreds of years, and nobody can guarantee 100% what's still buried under that earth. What the British government did on Gruinard was deliberate, calculated, and hidden for decades. But the next island on this list has a different kind of concealment. Here, the government didn't contaminate the soil. What happened here was worse in a different way.

[00:11:10]It was completely inexplicable, and it still is.

[00:11:14]On the 15th of December, 1900, the cargo vessel Arch Door was sailing from Philadelphia to the port of Leith in Edinburgh. As it passed to the Flannan Isles archipelago in the Outer Hebrides, the captain and crew noticed something that should not have been possible. The lighthouse on Eilean Mor, a lighthouse that had operated without interruption since 1899 and whose beam was visible for more than 25 km, was completely dark. The Ashtore logged the observation and continued to Leith.

[00:11:46]When the captain reported the anomaly to the authorities, the Northern Lighthouse Board dispatched the relief vessel Hesperus to the Flannans. The weather was so severe that the Hesperus couldn't get close to the island until Boxing Day.

[00:12:00]When it finally arrived, Captain Jim Harvey sounded the horn and fired signal flares. Nobody responded. Relief keeper Joseph Moore disembarked alone. He climbed the 160 steps cut into the rock leading up to the lighthouse. The door was shut. He went in. Inside he found the kitchen table set but untouched, an overturned chair, the wall clock stopped, one of the three keepers' oilskin coats still hanging on its hook, which was inexplicable given that outside a ferocious storm had been raging for weeks, and no trace whatsoever of the three men who were supposed to be there. James Ducat, Thomas Marshall, and Donald McArthur had vanished. The last entry in the service log was dated the 15th of December.

[00:12:46]Marshall had noted that the weather was extremely severe and that Ducat and McArthur were praying. It was the first time anyone had recorded those two men, both seasoned veterans known for their composure, praying during a storm. There was never another entry. The island was searched from end to end. Every crack, every cave, every inch of the rocky coastline was inspected. Nothing. The three men had disappeared without trace from an island it was impossible to swim away from in the middle of the Atlantic Ocean in December. Theories multiplied over the years. A rogue wave sweeping them away while they repaired equipment on the cliffs, an accident in the dark, a conflict that ended in tragedy. In 2018, researchers analyzed the weather patterns from those specific days and concluded that a series of waves up to 20 m high produced by the convergence of two separate storm fronts may have struck the eastern side of the island without the keepers anticipating it.

[00:13:47]It's the most plausible explanation. It is not a certainty. The Flannan Isles today are a nature reserve. Access to the automated lighthouse is restricted and requires a permit from the Northern Lighthouse Board. The lighthouse still works and the question of what exactly happened on that December night in 1900 remains unanswered. Three men who disappeared from an island there was no way out of. But what you'll find on the next island isn't absences, it's presences that shouldn't be there. An island abandoned in 1974 that since then has developed its own rules, its own inhabitants and its own way of keeping humans at a distance. In 1974, a woman and her brother got into a boat, crossed the fierce currents of the Pentland Firth and left behind the only home they had ever known. They were the last members of the Rosie family, the only family remaining on the small island of Swona off the northern Scottish coast between Orkney and Caithness. Before they left, they released their cattle onto the pasture.

[00:14:51]They assumed they'd be back soon or that someone from the family would return.

[00:14:56]Nobody came back. The cattle have been on Swona for 50 years and they are no longer domestic cows. Swona has a human history stretching back 5,000 years.

[00:15:07]There are Neolithic tombs, Viking farmstead remains and a ruined medieval chapel. But what makes this island practically inaccessible today isn't any of those structures, it's the extreme nature of the Pentland Firth currents, one of the most dangerous stretches of water in the world, and the fact that the island is private property belonging to descendants of the Rosie family, who have not authorized public access since they abandoned it.

[00:15:34]The cattle that stayed behind have developed behaviors that ethologists, the scientists who study animal behavior, have never previously observed in domestic livestock. They live in a mixed-sex herd like wild horses or deer.

[00:15:49]Bulls compete for dominance, and the loser is exiled to a small headland at the far end of the island. When one of them dies, the rest of the herd forms a circle around the body and stands motionless for hours. They've adapted to forage for seaweed on the rocks during winters when the grass runs thin. They are, in every sense that matters, wild animals in the bodies of cows. In 1975, a year after the abandonment, an attempt was made to round up the cattle and bring them to the mainland. The attempt was abandoned. The currents were too dangerous. There was no adequate landing point, and the cows wouldn't be caught.

[00:16:27]In 2022, the MV Alfred ferry crossing between Gills Bay and Orkney briefly ran aground near Swona after the captain fell asleep. Nobody was hurt, but the incident illustrates well what kind of water surrounds this island. In 2024, a group of 10 students from Gordonstoun School obtained special permission from the owners to spend eight days on the island. They rebuilt the old pier, some paths, and drystone walls. They pumped water from a well a thousand years old.

[00:16:58]They cooked on open fire, and they lived alongside, at a safe distance, a herd of animals that have spent half a century building their own culture in the complete absence of humanity.

[00:17:09]The owners don't grant permits regularly. Swona remains, for all practical purposes, unreachable, an island where time stopped in 1974 and the animals took over.

[00:17:20]But if Surtsey is a forbidden island by virtue of of abandonment and dangerous currents, the next one is forbidden for something entirely different. For what's buried in it. And for what might still be active.

[00:17:33]4 km from the center of Edinburgh, in the Firth of Forth estuary, there's an island anyone can try to reach on foot.

[00:17:40]The problem is that the sea decides when you're allowed to leave. And in recent years, dozens of people have learned that lesson the hard way. Cramond Island is a tidal island. When the tide drops, a concrete causeway built during the Second World War is exposed, connecting the island to the Cramond neighborhood of Edinburgh. The causeway runs for just under a kilometer and is flanked on both sides by rows of reinforced concrete pylons, built originally to prevent German submarines from passing through the estuary. The image is strange and beautiful at once. An avenue of concrete teeth rise from the water, leading to a deserted island full of rusted fortifications and crumbling wartime bunkers.

[00:18:24]But the tide rises faster than it looks, and it rises without warning.

[00:18:29]In the first half of 2023 alone, the Queensferry rescue team carried out 27 rescue operations at Cramond Island. 27.

[00:18:38]That was 57% of all their call-outs that year. Every one of them to retrieve people trapped on the island or on the causeway by the rising water. On a single day in October 2024, eight people were rescued simultaneously. The RNLI, Britain's national maritime rescue institution, has developed a specific service for Cramond. Text the word Cramond to 81400 and you receive that day's safe crossing times. The signage at the entrance to the causeway is large and explicit. None of it has eliminated the problem.

[00:19:12]Cramond has its own history beyond tidal accidents. There are prehistoric stone burial cists. The Romans used the adjacent village as an outpost. During the Second World War, the island was fitted with a 75-mm gun and searchlights to illuminate targets in the dark. The underground network of generators, stores, and weapon emplacements is still standing, partially explorable, partially dangerous. The island itself isn't formally forbidden in legal terms, but nature has built around it a prohibition more effective than any law, the sea. And the sea makes no exceptions. It doesn't distinguish between reckless tourists and well-meaning people who simply misjudged the timetable.

[00:19:55]What makes Cramond unsettling isn't only its physical danger, it's what it reminds you of, that some prohibitions don't need signs. Some are imposed by geography itself. And if the sea can draw an invisible border around an island minutes from a major city, imagine what it does in the middle of the North Atlantic around a 30-m wide chunk of rock that three different countries claim as their own and none can prove belongs to them. There is a place in the North Atlantic that technically belongs to Scotland, but cannot be inhabited, cannot be visited with any regularity, and whose sovereignty is simultaneously disputed by the United Kingdom, Ireland, Iceland, and Denmark on behalf of the Faroe Islands. It has no beach, no vegetation, no fresh water. It is 30 m wide and 21 m above sea level. It's called Rockall.

[00:20:48]And beneath it, on the seabed, there may be oil and gas reserves worth up to $160 billion.

[00:20:55]The earliest written records of Rockall date to the 15th century, but nobody landed on it in any documented way until 1811, when a Royal Navy officer led a small expedition to its summit. For more than a century after that, the islet was ignored by every government. That changed in 1955 when the United Kingdom decided it needed to claim it urgently.

[00:21:18]Declassified NATO documents reveal the real reason. The British government had just decided to install a guided missile testing range on South Uist in the Outer Hebrides.

[00:21:29]Rockall, more than 400 km away in the Atlantic, was the point from which enemy agents could observe and record those tests. In September 1955, a group of Royal Marines landed on Rockall, cemented a bronze plaque into the rock, and raised the Union Flag. It was the last territorial expansion of the British Empire. In 1972, Parliament formally passed the Island of Rockall Act, incorporating it into Scotland.

[00:21:57]Ireland never recognized that incorporation. Iceland didn't either.

[00:22:01]Denmark didn't either. And in 2017, when Scotland began asserting exclusive fishing rights within a 12-mi radius around Rockall, the conflict reached a diplomatic level that still hasn't been resolved. The human history of Rockall includes chapters that say a great deal about the nature of territorial obsession. In 1985, SAS veteran Tom McClean spent 40 days roped to the rock to assert British sovereignty. In 1997, three Greenpeace activists endured 42 days on it to protest oil exploration, renaming it Waveland. In 2014, Scottish adventurer Nick Hancock survived on Rockall for 45 days, breaking the record with supplies sent from the mainland.

[00:22:46]Today, Rockall has no formal access restriction, but its physical conditions make access impossible in practice for anyone who isn't an elite climber or an adventurer willing to tie themselves to a rock in the middle of the Atlantic for weeks. There's nowhere to land a boat in normal conditions, no fresh water, and the sea around it is among the most violent in the northern hemisphere.

[00:23:11]Rockall is a rock with nothing on it, but what lies beneath it on the seabed remains one of the most active geopolitical flashpoints in Europe. And while four countries keep arguing about who it belongs to, it effectively belongs to none of them. If Rockall is an island nobody can claim, despite everyone trying, the next one is the exact opposite. Someone claimed it, lived on it for 2,000 years, and then the government emptied it of people for good. 40 mi west of the Outer Hebrides, at the most remote point of inhabited territory in the North Atlantic, there's an archipelago that takes its name from a saint who probably never existed, and that for more than 4,000 years was home to one of the most isolated and self-sufficient human communities the world has ever produced.

[00:24:00]It's called St. Kilda, and on the 29th of August 1930 its last 36 inhabitants boarded HMS Harebell and left forever.

[00:24:09]The St. Kildans had spent centuries surviving in conditions that would have destroyed any other community. They hunted gannets and puffins by climbing 400-m cliffs with ropes they made themselves.

[00:24:22]They used seabird oil as fuel for their lamps. They cultivated what the volcanic terrain allowed and fished in waters that could turn fatally violent within hours. They had developed their own political system, the St. Kilda Parliament, a daily gathering of adult men in which the tasks of the day were decided collectively, a direct democracy in miniature in the middle of the Atlantic. But contact with the outside world which increased from the second half of the 19th century as steam-powered tourist ships began making regular summer visits brought them not prosperity, but diseases for which they had no immunity, dependence on goods they couldn't produce themselves, and an awareness of what they were missing. Young people began leaving. In 1926, four men died of influenza.

[00:25:12]The winters became unsustainable without enough hands to keep the community going. In January 1930, a young woman named Mary Gillies fell ill with appendicitis. There was no doctor on the island, no way to operate there. She was taken by boat to the mainland, but arrived too late. She died in hospital.

[00:25:31]Her death was the last signal the islanders needed. In May 1930, 20 of them signed a petition to the British government requesting collective resettlement on the mainland.

[00:25:43]In August, the government agreed. What happened afterwards is what turned St. Kilda into a story of institutional abandonment as dark any formal prohibition. The government resettled the islanders at various points on the Scottish mainland, in forested areas with nothing in common with the coastal life they had always known. Many died in the years that followed from exposure to illnesses they had no resistance to.

[00:26:08]Some tried to return.

[00:26:10]Permanent return was not permitted.

[00:26:12]Since 1930, St. Kilda has belonged to the National Trust for Scotland. There is a small military and scientific base on the main island, Hirta. Researchers can apply for access. Tourists can arrive on organized excursions in the summer season when weather conditions allow, which isn't always. The island group is a UNESCO World Heritage Site, one of the few places in the world with that dual distinction for its natural and cultural value simultaneously. But, the story of St. Kilda is the story of a community left alone for too long, that asked for help when it was already too late, and that was resettled in a way that most of them didn't survive in any dignified sense. There are no signs banning access to St. Kilda. There is something harder to ignore.

[00:27:00]The certainty that nobody did enough while there was still time. The story of St. Kilda is one of abandonment that lasted centuries. But the last island on this list has a different story. Here, it wasn't abandonment that made it forbidden. It was what the government actively did with it in secret and what still exists beneath its surface today.

[00:27:21]There's an island in the Firth of Forth so small for it that most tourists crossing the famous railway bridge that spans it don't even know they're passing over it. Inchgarvie, less than a hectare of dark rock in the middle of the estuary, on which the legs of the Forth Bridge rest directly. It is impossible to visit. It is equally impossible to ignore once you know what has taken in place there. Inchgarvie has a history that summarizes in miniature the way the powerful have always used inaccessible places to do things they'd rather nobody witnessed. In 1491, King James IV, the same king who years later would carry out the language deprivation experiment on Inchkeith, ordered several condemned criminals to be imprisoned on Inchgarvie with no resources beyond whatever the island itself could offer. The castle built on it during that period was used as a prison for generations.

[00:28:17]It was not a prison with cells and bars.

[00:28:19]It was an island from which escape was impossible. The sea did the work.

[00:28:23]Through medieval and early modern Britain, Inchgarvie was also a strategic defensive point controlling the estuary.

[00:28:31]Any naval threat attempting to sail the Forth toward Edinburgh had to pass it.

[00:28:36]Through the centuries of near constant conflict between Scotland and England, the island changed hands repeatedly, was attacked, taken, and retaken.

[00:28:45]English troops occupied it. French forces helped recover it for the Scots.

[00:28:50]For centuries, it was an island without peace. When the industrial age arrived and the decision was made to bridge the Forth with a railway crossing, engineers had no hesitation in using Inchgarvie as their central support point. The construction of the Forth Bridge, completed in 1890, made the island a permanent part of one of the most photographed engineering structures in the world. And it buried it definitively under steel and concrete.

[00:29:18]Today, Inchgarvie is managed by the authority responsible for the bridge.

[00:29:22]Access is not permitted. The only people who regularly set foot on its surface are maintenance workers for the rail infrastructure. From the shore, it's perfectly visible. A patch of dark rock framed by the great curving spans of the bridge in the middle of an estuary the tide turns into a gray mirror.

[00:29:41]An island that never knew peace. That served as a prison, a fortress and a foundation. And that today remains inaccessible for the same reasons it always was. Because those who control it prefer it that way. But everything you've heard up to now, the experiments, the anthrax, the disappearances, the sovereignty disputes, all of it leads to the final island on this list. The most disturbing one. The one whose history the British government kept classified for decades. And which, when it finally came to light, revealed that what happened on Gruinard was not an isolated case. It was simply the one that made it into the newspapers.

[00:30:21]There's something about Inchkeith that wasn't told in the earlier chapter.

[00:30:25]Not by accident.

[00:30:27]But because the darkest part of its history isn't King James the Fourth's language experiment, or the syphilis and plague quarantines, or the Russian sailors buried in its soil. The darkest part is what happened on Inchkeith during the years between 1880 and 1916 when the island was used systematically as a quarantine laboratory for diseases that the British Empire did not want reaching its cities. Inch Keith's role as a quarantine point didn't end in the 17th century. It extended well into the 20th. Ships arriving from the colonies, from India, Africa, the Caribbean, docking at Leith with sick passengers or crew were diverted to Inch Keith before being allowed to berth. The sick were put ashore there. Some recovered, others didn't. The death records from the island during that period are incomplete by design. Nobody kept a systematic account of who died on an offshore quarantine island. Nobody was meant to.

[00:31:25]During the First World War, Inch Keith was fully militarized. The quarantine facilities were replaced by artillery batteries, earthwork forts, and naval observation systems. The island was declared a restricted military zone. A classification that remained in place in various forms for decades after both World Wars had ended. The full files on the island's military use stayed classified until the 1990s.

[00:31:52]What the declassified records reveal is that Inch Keith was discussed at ministerial level as a potential site for additional experiments during the Second World War.

[00:32:03]In the same context in which Gruinard was selected for the anthrax tests, the island was assessed as a location for testing chemical and biological agents.

[00:32:13]The proposal was rejected most probably because of its proximity to Edinburgh, just 5 km from the coast. But the fact that it was on the list at all reveals something about how the government of that era thought about these places, inaccessible islands, politically convenient, perfect for doing things that nobody was supposed to see. Today, Inch Keith remains off limits to the general public. The Northern Lighthouse Board took ownership after the lighthouse was automated in 1986.

[00:32:44]And the island was subsequently sold.

[00:32:46]There is no regular transport, no operational pier, and the Firth C is hostile enough to discourage any unplanned approach. What makes Inch Keith the most disturbing island on this list isn't any single event. It's the accumulation. 500 years of the systematic use of an inaccessible place to do things that power in every era preferred to keep away from public view.

[00:33:10]Experiments on children, mass quarantines without oversight, the sick sent to die far from the cities, assessments for biological weapons testing, an island 5 km from Edinburgh, visible from the shore on a clear day, and completely beyond the reach of anyone who wants to know what happened there.

[00:33:30]That's what all 10 islands on this list have in common. They're not forbidden by accident.

[00:33:36]They're forbidden because at some point in their history someone decided that what was happening on them should not be seen. The sea does the rest.

[00:33:44]There's something about these 10 islands that nobody talks about. While governments were sealing some off, emptying others, and contaminating a few more, there were Scottish families who chose to stay on islands just as remote, just as battered by wind and sea, just as forgotten by the mainland. They've been there for 500 years, and they still refuse to leave. The next video takes you to meet them.