One of History's Biggest Fortresses Was Hidden for 4,000 Years

[00:00:00]Imagine discovering a city so enormous that it rewrites the history of an entire civilization. A city built over 4,000 years ago with gigantic stone walls, a 70 m pyramid, a palace the size of 10 soccer fields, and [music] evidence of human sacrifice buried beneath its gates. Yet somehow history forgot it ever existed. No emperor ever claimed it. No ancient record tells us who built it. No one even knows what its real name was. Today, we're uncovering Shermau, one of the greatest archaeological discoveries of the 21st century. But the deeper archaeologists dig beneath its ancient stones, the more impossible one question [music] becomes.

[00:00:41]How does one of the largest cities of the ancient world simply disappear from history?

[00:00:49]The first hint came in the 1970s.

[00:00:52]>> [music] >> A scholar named Dai Ingson from Northwest University followed up on local stories about a sacred tree. That search led him to the earliest documented investigation of the site. It was modest work by [music] later standards. But the jade was already there, already out of place, already asking a question nobody had the tools to answer yet. For decades, that's where things stayed. [music] Curiosity, a handful of collected jades. Archaeology runs on funding and permission and slow, careful survey work, [music] and Shermau simply wasn't a priority. It sat quietly under the lust for another generation.

[00:01:30]Then in 2011, everything changed. Sona Yong, now head of the Shangi Academy of Archaeology, led the first full excavation of the site. What he found stunned him. Standing inside it, he couldn't even grasp how big it really was. Relics from the Long Sean culture period turned up on almost every hill around him. He nicknamed the ruins the crazy stones. Half joking because prehistoric cities in this part of China were supposed to be built from earth, not stone, and not preserved this well.

[00:02:01]The scale is hard to overstate. Shermau covers roughly 4 million square me.

[00:02:07]That's nearly six times the size of the Forbidden City. It makes Shermau the largest city ruin of its era found anywhere in China. The main site dates to somewhere between 2300 and 18800 B.CE. Covers more than 400 hectares. At its heart is a central palace terrace wrapped in two rings of stone wall and rising above all of it. A stepped platform more than 70 m tall that's nearly half the height of the pyramids of Giza built roughly in the same era on the other side of the world. But unlike Giza, this pyramid had a purpose beyond burial. At the top sat a palace over 80,000 square meters, close to the size of 10 soccer fields. By 2012, Shermau made China's official list of the year's top 10 archaeological discoveries. It later earned international recognition as one of the major finds of the 21st century. This is not a fringe site. It's one of the most celebrated excavations in modern Chinese archaeology. And that matters because the mystery here isn't about a cover up. Nobody hid this city.

[00:03:13]But if nobody hid this city, why does nobody in the historical record seem to have written about it?

[00:03:23]Here's the puzzle at the center of Shermau. And it's a real one. The archaeologists who dug it up admit it openly. Before this excavation, the site was completely absent from ancient Chinese texts. No famous ruler, no recorded name, nothing connects Shermau to any king or dynasty we know from the old records. That's a strange kind of silence. China's earliest texts were compiled centuries after the fact. They center on the Yellow Rivers middle and lower stretches far to the south. They describe a legendary founding dynasty, the Sya, and a world of walled towns and sage kings. What they don't describe is a fortified 1500 acre metropolis on the edge of the Ordo step sitting right at the frontier between farmland and grassland. Let's be fair to the mainstream position here because it's a careful one, not a dismissal. Texts compiled a thousand years after the fact by scribes from one regional lineage were never going to record every power center in the wider landscape. Being left out of the old books isn't proof that a place didn't matter. It's proof of whose story got written down and by whom centuries later in a different region entirely. Even the closest legendary link anyone has drawn. A loose connection to the Sia dynasty is treated by archaeologists as unconfirmed. The excavation hasn't settled it either way.

[00:04:46]That's the responsible answer. It deserves to be said [music] plainly, not brushed aside for drama. But look at what it actually admits. Everything we know about who ruled the city, what they called themselves, what language they spoke, how they saw their place in the world, all of it comes from stone, bone, and jade. None of it comes from a single word the people who lived there ever wrote down. This was one of the largest urban centers on the planet at the time.

[00:05:12]And its name today is just borrowed from a nearby village. Whoever ruled from that 70 m platform, history never learned to say their name.

[00:05:25]Walk along the inner citadel walls, an area archaeologists call Hangtai, the Imperial City Terrace, and the stone starts looking back at you. Carved into the facing stones are human and animal faces. These aren't scattered rubble.

[00:05:40]They were built into the wall on purpose. Some are small, worn down by time. Others are startling. In 2022, archaeologists uncovered a new large stone face on the platform's retaining wall. One face on the western side measures about 80 cm long and 50 cm high. It wears what looks like a headdress. It's the largest single carved image found at the site. And the excavation team thinks it may represent a specific ruler, [music] not just a generic god. This is where the mainstream reading and the open question really start to pull apart. Let's look at both sides fairly. The cautious view face motifs, especially wide staring eyes, show up across many early Chinese Neolithic cultures. Nothing exotic is needed to explain them. Carving a symbolic protector into a wall or a doorway is one of the most common instincts in the ancient world. You see it in Mesopotamian eye idols. You see it in early Mesoamerican masks. Cultures with zero contact reached for the same idea independently again and again.

[00:06:43]Shared symbols don't need a shared source. The harder question is about style. Some researchers see loose visual links between Shermouse carvings and the Jade tradition of Leonghu, a sophisticated culture that flourished near the Yangze Delta over a thousand km south. Langon Xu had already largely collapsed by the time Shermau's walls went up. If craft knowledge really moved across that distance and time gap, it means long range contact across Neolithic China on a scale the textbooks don't usually describe. This connection is still debated. It hasn't been settled, but it's a real live academic question, not something invented for the sake of mystery. What isn't in question is everything else built into these same walls. Shermau had no local source of jade, [music] but plenty of it turns up here, meaning it was imported from far away. carbon dating from samples processed in 2019 places the core construction between roughly 2,200 and 1900 B.CE. This wasn't an isolated hilltop settlement improvising its own symbols in a vacuum. It was a city with the labor, the reach, [music] and the trade connections to pull rare stone from a thousand miles off and carve it into a face that has outlasted its own name. And underneath those same watching walls, archaeologists found something much harder to look at.

[00:08:05]The main entrance to Shermau's outer wall is called the east gate. It sits at the highest point of the entire site with sweeping views over the valley. Of everything at Shermau, this gate was the most heavily defended and the most ceremonially important. It's a sophisticated defense system, baffled entrances, gate [music] towers, bastions, corner towers with a main gate decorated in painted murals. It's also where archaeologists found [music] the pits. Above them stand stone monuments carved with watching eyes. [music] Nearby stones are covered in thousands of fragments of fine jade. And beneath the gate itself, dozens of human skulls.

[00:08:45]The excavation team's finding is stark.

[00:08:47]Every identified victim was a teenage girl. Archaeologists believe they were sacrificed during the city's founding ceremony. Other reporting confirms it.

[00:08:57]Many skulls were found specifically under the city gate, consistent with ritual killing tied to construction.

[00:09:03][music] The formal excavation summary is direct. Shermau functioned as a regional center of both politics and ritual. The evidence includes human sacrifice performed before the fortification was even built alongside the jade, early bronze work, and the painted murals at the gate. We should be careful here. It would be easy to sensationalize this, but foundation sacrifice tied to major construction shows up at other sites from this period in this wider region is a known if grim pattern in how early states formed is not unique to Shermau.

[00:09:35]The mainstream reading is this a group capable of building a 5 km wall, a 70 m platform, and a trade network reaching a thousand miles for raw jade. That same group had the authority to demand human life as a ritual offering. Maybe at the city's founding, maybe during a later crisis. What we still don't know and what ongoing isotope and genetic testing is trying to answer is who these young women actually were. Local residents drawn into a ceremony that consumed them. Captives brought in specifically for this purpose. Members of a rival group defeated and repurposed as an offering for the very walls meant to keep such groups out.

[00:10:17]It would be easy to treat Shermau as one impossible city standing alone on an empty step. It wasn't. And this is where the real story gets stranger than anything invented because every time archaeologists dig deeper, the picture keeps growing. Shermau is just one of more than 70 stone age settlements found across the same region of Shani. More than 70 stone towns from the same Lan period horizon have now been uncovered across a huge stretch of territory from the Alaiep in the north all the way to coastal regions near the Yellow Sea.

[00:10:49]Shermau was clearly trading and exchanging ideas across this entire network. It wasn't isolated at all. Sit with that for a second. [music] It flips the picture most of us carry of ancient China. The textbook version usually starts with one tight core along the central Yellow River. slowly expanding outward toward the Shang dynasty and the history everyone learns in school.

[00:11:11][music] But what these excavations actually reveal is different. A dense connected frontier world. Dozens of fortified stone settlements strung across a huge ark of the Lust Plateau.

[00:11:23]All in contact with each other and with cultures far beyond. And all of this happening centuries before the official start of Chinese civilization most people were taught about. Researchers studying the region don't shy away from that shift. They describe finding an entirely unexpected complex settlement system on the north lust plateau. A region long thought of as nothing more than a frontier of Chinese civilization.

[00:11:48]Not a center of it. That word frontier is doing a lot of work in that sentence.

[00:11:53]Frontier of what exactly? If Shermauo and its 70 sister settlements were already thriving here, five centuries before the traditional start date of dynastic China, then the center of this plateau was supposedly on the edge of might not have existed yet. Not in any meaningful form. The real map of where Chinese civilization began may need to stretch much further outward and much further back than one river valley allows.

[00:12:20]And then within a few centuries of reaching this scale, Shermau goes quiet.

[00:12:24][music] The occupation window runs roughly from 2300 to,800 B.CE. About 500 years. That sounds long until you remember what got built in that time.

[00:12:35][music] A 5 km wall system, a 70 m platform, an 80,000 m palace, a trade network stretching a,000 m, at least two waves of ritual killing. All of it raised and then abandoned in less time than separates us today from the height of the Roman Empire. There's no single burn layer across the whole site. No sign of a one-day conquest. What the evidence shows instead is a slow decline, a once dominant regional power, [music] gradually losing its people and its influence over generations, not destroyed in one blow, simply no longer sustained. The leading explanation is environmental, and it's a strong one backed by regional climate data. Around this period, large parts of Eurasia went through a drying, cooling shift. That same shift has been linked to the decline of other societies too from the Indis Valley to parts of Mesopotamia.

[00:13:30]Shermau sat right on the ecological seam between farmland and step grassland.

[00:13:34]That's exactly the kind of place that fails first when the climate turns. The same location that made Shirmau a powerful trade hub in good years may be what made it unsustainable when conditions changed. That explanation holds up. It doesn't need to be argued away, [music] but it doesn't answer everything either. Where did the population actually go? Why was a site with this much labor and ritual meaning poured into it never rebuilt at anything close to its old scale? A network this powerful able to command human sacrifice and thousandm jade shipments should leave some clear trace of handing off its authority to whatever came next. Did people scatter into the 70 other settlements already dotting the plateau?

[00:14:16]Did the ruling class move south closer to the river valleys where the recognized early states eventually rose?

[00:14:22]Or did the whole symbolic world, the carved eyes, the memory of the city itself, simply stop being carried forward by anyone at all?

[00:14:34]To understand how strange this silence really is, it helps to place Sherau next to the two other giants of prehistoric Chinese archaeology most people have actually heard of. To the south, centuries earlier, the Langonu culture near the Yangy Delta built its own walled towns, its own elite jade tradition, its own layered ritual system. [music] Then it collapsed. Its cities abandoned well before Shermau's walls even went up. Centuries later to the southeast, the site of Erlatu rose along the Yellow River's central stretch. Most mainstream scholars treat Eratu as the strongest physical candidate yet found for the historical sia or at the very least an early bronze age state that led directly into the world the old texts describe. Shermau sits almost exactly between those two stories. Too late to be Leonghu, too early and too far north to comfortably fit inside Euru's narrative. And yet it's bigger than both of them combined in raw scale. bigger fortifications and just as dramatic evidence of centralized ritual power in the form of the sacrifices at the gate. Of the three, it's the only one no ancient text seems to know by name. This isn't a suppressed mystery. It's a published, actively debated, completely mainstream one.

[00:15:48]Chinese archaeologists themselves are the ones asking these questions in peer-review journals, not on fringe websites. But the honest answer right now to who built Shermau and why doesn't anyone seem to have written it down is simple. We don't fully know yet. The dig is still active. The testing on the sacrificial remains is still running.

[00:16:08]The Leonghu connection is still debated, [music] not resolved.