Impossible Ancient Structures They Actually Built

These structures shouldn't exist. The tools to build them had not been invented yet. The math to design them had not been written down, and thousands of years later, we still can't explain how some of them were done. Today, I'm counting down 10 ancient structures built before they should have been possible. Starting with number 10, Mohenjo-Daro in Pakistan. Four and a half thousand years ago, in a river valley in what is now southern Pakistan, someone built a city of 35,000 people with flush toilets, underground sewage, and a civic plumbing system that most of Europe wouldn't match until the 1800s. This city is called Mohenjo-Daro, Mound of the Dead, and it belonged to the Indus Valley civilization, one of the three oldest urban civilizations on earth. The streets here were laid out in a precise grid pattern, straight lines intersecting at right angles, at a time when most other civilizations on earth were building an organic sprawl. The bricks they used throughout the city were standardized, the same dimensions, the same ratios across every building and in every district. Almost every house had its own private bathroom, a raised brick platform with a sloped floor draining through a pipe in the wall, into covered drains that ran beneath the streets. Some houses had what National Geographic has described as the ancient world's earliest known flush toilets. This was a seated commode connected by a clay pipe to the underground sewer, flushed by pouring a jar of water down from the house's private well. The sewers themselves were about 2-3 feet wide, they were lined with fitted brick and built with inspection holes at regular intervals so they could be cleaned. They connected to cesspools that were periodically emptied, and the city had more than 700 wells. There was this great bath, a public structure measuring about 39 by 29 feet and about 8 feet deep. It was waterproofed using a sandwich of baked brick, gypsum plaster and natural bitumen. It held over 21,000 gallons of water and it's believed to have been used for ritual purification. That waterproofing technique was so effective that some engineers have noted it outperformed some modern equivalents. This civilization that built all this left no identifiable king, no palace, no army, no statues, and a script that's never been fully deciphered despite over a century of effort. Around 1900 BC, the Indus Valley civilization collapsed and nobody knows why. The cities were abandoned, the sewers stopped, the grid streets were buried, and Mohenjo-Daro wasn't rediscovered until 1922. 9. The Great Dam of the Marib, Yemen The Great Dam of Marib was a structure so far ahead of its time that its engineering principles weren't understood by outsiders for centuries after it was built. Constructed around 750 BCE in what is now Yemen, the dam spanned about 2,000 feet across the Wadi Adhana, nearly twice the length of the Hoover Dam. It stood roughly 60 feet high at its tallest point. This was built without concrete or steel, without any of the materials that modern construction considers essential. The Sabaean engineers here used interlocking stone blocks, earthen fill, and a waterproofing system based on compacted sediment layers. The dam didn't just simply hold water, it did redirect it. A sophisticated system of sluice gates, spillways, and irrigation canals channeled the seasonal floodwaters into the Wadi into a network of agricultural fields covering about 25,000 acres. It transformed one of the most dry landscapes on Earth into a fertile oasis, capable of supporting a population estimated between 30,000 to 50,000 people. This was the kingdom of Sheba, the name Sheba mentioned in the Hebrew Bible and the Quran, and its wealth was built almost entirely on the agricultural surplus made by the dam. Incense, myrrh, and spices grown in the irrigated fields were traded across the ancient world. The queen of Sheba's legendary visit to King Solomon was financed, in effect, by a feat of hydraulic engineering constructed before the Roman Republic existed. This dam stood for over a thousand years. Modern dams, by comparison, have an operational lifespan of about 50 to 100 years. The Great Dam of Marib was repaired and modified repeatedly over its life, and when it finally failed catastrophically around 575 AD, the resulting flood and loss of irrigation is recorded in the Quran as a divine punishment. A dam built in 750 BCE shaped the geopolitics of 7th century AD. Damn. 8. Masudno-Iwafuni, Japan On the hillside in the village of Asuka, in the Nara Prefecture of Japan, sits a granite monolith that weighs about 800 tons. It's 11 meters long, 8 meters wide, and about 4.5 meters tall. It's got a flat top with a slight ridge running down the center, and two perfectly square holes drilled into the upper surface, each roughly a meter deep. The holes serve no structural purpose that anyone has been able to identify. Nobody knows who carved it or when, precisely when it was carved. Nobody knows what it was for. The stone is called Masudno-Iwafuni, the Rock Ship of Masuda, and it's one of the most enigmatic objects in Japanese archaeology. Asuka was the political center of Japan from the late 6th to the early 8th century, and the village is scattered with mysterious carved stone objects from this period, over 20 of them, whose origins and purposes are almost entirely unknown. The Masudno-Iwafuni is the largest and most striking. It doesn't resemble any known Buddhist or Shinto religious structure. It doesn't match any architectural convention from the Kofun or Asuka periods. It sits at an angle on the hillside, partially buried, as if it's been there for long enough for the landscape to shift around it. The most common theory among Japanese archaeologists is that it may have been intended as an astronomical observation platform, with the two square holes functioning as sighting apertures aligned with celestial events. Another theory holds that it was the base for a now-vanished structure that sat on top of it, and a third suggests it was part of an unfinished project, perhaps intended to be moved to a different location, that was abandoned when its weight made transportation impossible. The granite from which it was carved isn't local to this area. It was quarried from a source that hasn't been definitively identified. However, 800 tons of granite was moved to this hillside. By whom and for what reason is still an open question. It still sits on the hillside in silence, undamaged and unexplained, essentially ignored by the thousands of tourists who visit Asuka's more famous sites every year. 7. Nan Madal, Micronesia In the middle of the Pacific Ocean, on the southeastern shore of the island of Pohnpei in Micronesia, there's a city built on a coral reef. It consists of 92 artificial islands, constructed from about 250 tons of basalt columns that are stacked like logs, connected by a network of canals and seawalls. This is an engineering project so large and improbable that the first European sailors to encounter it in the 1800s refused to believe it had been built by the locals. They assumed it must be the work of a lost civilization or sunken continent, or some force that the islanders themselves couldn't have commanded. They were wrong about all of those, but they were not wrong to be astonished. Nan Madal was built by the Saudelur dynasty, which ruled Pohnpei for about 500 years, beginning around the 12th century. The basalt columns used in the construction here are naturally occurring prismatic formations, hexagonal and pentagonal logs of volcanic rock, similar in shape to the Giant's Causeway in Northern Ireland, quarried from the opposite side of the island and then transported across miles of ocean. No mortar was used here, no cement, no metal tools. The columns were stacked in alternating courses, header and stretcher fashion basically, relying on entirely weight and friction to hold them. The seawall enclosing some of the islands are about 25 feet high and 17 feet thick. The largest single stone used here weighs about 50 tons. No evidence of roads, sledge paths, or canal systems connecting the quarry to the construction site have been found, and how they were transported is the central engineering mystery. The oral tradition among the Pohnpeian people hold that two sorcerer brothers, Olishipa and Olushopa, used magic to fly the stones through the air into position, and when pressed for a non-magical explanation, modern archaeologists have proposed rafts, levers, and log rollers. But experimental attempts to move stones of comparable weight using these methods on Pohnpei have made only partial success. The Sautillier dynasty eventually collapsed around the 1600s, and An Madal was abandoned, and it's been slowly sinking into the reef ever since. UNESCO did add it to the World Heritage list in 2016, and it simultaneously placed on the list of World Heritage in Danger. 6. The Kailasa Temple in India The Kailasa Temple at Ellora wasn't built, it was subtracted. Unlike virtually every other large structure in human history, this one wasn't assembled from pieces, it was excavated downward from a single cliff of rock, carved from the top down starting at the roof and working to the floor, removing about 200,000 tons of rock in the process. What was left behind is a freestanding temple, 276 feet long, 154 feet wide, and 100 feet tall, complete with pillars, staircases, galleries, and windows, sculpted friezes depicting scenes from Hindu mythology, life-sized elephants carved from the bedrock, and a multi-story tower rising from the center, all of it from one continuous piece of rock. Nothing was added here, everything was already there, just waiting in the stone. The builder's job was to remove everything that wasn't the temple. The challenge of top-down excavation is fundamentally different from conventional construction, and in one critical aspect, it is harder. There's no room for error. A misplaced cut can't be corrected by removing a block and replacing it. A structural miscalculation can't be patched. Every cut has to be right the first time. This precision to require these carved pillars, arches, and multi-story interior spaces from a solid cliff without scaffolding, without blueprints as we understand them, and without the ability to see the finished structure from the outside until it was nearly complete, implies a level of spatial awareness and planning and three-dimensional visualization that modern architects still find difficult to replicate. The temple is attributed to Krishna I and is believed to have been carved in the 8th century AD. Some estimates suggest it was completed in about 18 years, which as a figure engineers have challenged, noting that the volume of rock removed would require the extraction of about 5 tons of stone per hour every hour for 18 years straight, assuming no interruptions. Whether the timeline is accurate or not, the result is the largest monolithic structure on Earth, carved with hand tools from a cliff in western India over 1,000 years ago. The 16th century Mughal emperor Aurangzeb reportedly sent 1,000 men to demolish it. They worked for three years and they barely scratched it. 5. The Stones of Baalbek, Lebanon The Temple of Jupiter at Baalbek in the Bekaa Valley of Lebanon is one of the largest Roman temple complexes ever constructed. But the most remarkable thing about it isn't the temple, it's what the temple sits on. The foundation platform, known as the trilithon, consists of three stones, each weighing approximately 800 tons, placed side by side with a precision that leaves virtually no gap. These are among the largest building blocks ever used in any structure on Earth, and nobody has conclusively explained how they were moved. To put 800 tons in perspective a bit, the heaviest object ever lifted by a modern mobile crane is about 20,000 tons. But that required the machine the size of a building, months of preparation, and a purpose-built road. The trilithon stones were quarried from a limestone bed a quarter of a mile away, moved across uneven terrain, and lifted into position on a platform that was already several meters high. The stones are so perfectly fitted together they appear to have been placed with mechanical precision. The tool marks do suggest the conventional Roman extraction technique with wedges and chisels and levers, but the transportation method is a matter of theory. No ramp capable of supporting 800 tons of limestone over a quarter-mile distance has been found or convincingly proposed. But in 2014, a German-Lebanese archaeological team discovered a fourth stone in the quarry, still partially attached to the bedrock. This one weighed 1,600 tons, the largest work stone in human history. A fifth stone found nearby in 2014 weighed over 1,000 tons too. These stones were clearly intended for the platform, but were never moved. Whether they were abandoned because they proved too heavy to transport or because the project was uninterrupted is still unknown. But what is known is that the Romans, or whoever laid the foundation before them, as some archaeologists believe the platform predates Roman construction, were working with stones so large that no single piece of equipment currently in operation on Earth could lift them in one piece. 4. NEWGRANGE, IRELAND Newgrange is a passage tomb in eastern Ireland that was built about 5,200 years ago, roughly 500 years before the Great Pyramid of Giza and 1,000 years before Stonehenge reached its final form. It consists of a large circular mound 85 meters in diameter, covering a stone passageway that leads to a cruciform chamber at its center. The mound is faced with white-squart cobblestone that was transported from the Wicklow Mountains about 80 kilometers to the south. This structure has been described as the finest example of Neolithic architecture in Europe, and it contains a feature that by the standards of the civilization that built it, should not have been possible. On the morning of the winter solstice, December 21st, the shortest day of the year, sunlight will enter through a small opening above the main entrance called the roof box. A beam of light travels down the 19-meter passage and illuminates the floor of the inner chamber for exactly 17 minutes. This happens only on the winter solstice, and for a few days on either side. The alignment is not approximate, it is precise to within a single degree of arc. The builders of Newgrange would have needed to calculate the exact angle of the sunrise on the shortest day of the year, design a passage that channeled the light over a distance of 19 meters with no deviation, and construct a roof box that emitted the beam in the correct height and width. They did this with stone tools, no written mathematical system, and no astronomical instruments more sophisticated than their own observations. The chamber itself has remained completely waterproof for 5,200 years. The corbelled roof, a dome ceiling constructed by progressively overlapping stone slabs, has never leaked. The stones used in this corbelled roof were selected for their specific shapes, and they fitted together without mortar. The structure has survived for over five millennia of Irish weather. Nothing inside is damp. If you're enjoying the video, please drop a like and a comment down below, it really does help the channel out. 3. The Rockhewn Churches of Lalibela, Ethiopia In the highlands of northern Ethiopia, at an elevation of about 2,500 meters, in a town that until recently had no electricity and no paved roads, there are 11 churches carved into the living rock. They weren't built, they were just excavated, top-down, from the solid basalt, each one chiseled from a single, continuous piece of stone. The largest, Bete Mahade Alem, is the biggest monolithic church on earth. The most photographed, Bete Georgis, is carved in the shape of a perfect Greek cross when viewed from above, descending 40 feet below ground level, surrounded by a trench cut from the rock on all four sides. These churches are connected by a maze of underground tunnels and walkways, with drainage channels, they were all carved from the same stone. They are all attributed to King Gebremeske Lalibela of the Zagwe dynasty, who ruled from about 1181 to 1221 and reportedly commissioned the churches after Christian pilgrimages to Jerusalem were cut off by Muslim conquests. His vision was to build a new Jerusalem in the Ethiopian highlands, and the names of the churches and the features of the surrounding land were arranged to mirror the holy city. A stream running through the site was named the River Jordan. One church was named Golgotha, another contains a replica of the tomb of Christ. The entire complex is a theological map carved from rock. A Portuguese soldier who visited in the 1540s wrote, There are here certain churches cut out of the living rock, which are attributed to angels. Indeed, the work appears superhuman because they are each excavated with pillars, altars, and vaults out of a single rock with no mixture of outside stone. Well, when Muslim invaders attempted to destroy the churches with crowbars and gunpowder, they failed. The structures are so massive and deeply embedded in the bedrock that conventional demolition couldn't even damage them. Local tradition does hold that human laborers worked during the day and angels continued through the night. The only tools found at the site that might explain the carving are small, fragile, that looks better suited for farming or excavating, 200,000 tons of basalt 800 years after they were built, and all 11 churches remain in active use. Ethiopian Orthodox worshipers descend into them every day to pray. Number 2. Sigiriya, Sri Lanka In the year 477 AD, a prince named Kashyapa seized the Sri Lankan throne by murdering his father. According to the most widely cited account, he had the old king walled up alive inside a dam. His half-brother, Moggallana, the legitimate heir, fled to India to raise an army. Kashyapa, knowing his brother would return, abandoned the traditional capital of Annadapura and moved to a 200-meter granite column rising vertically out of the jungle. On top of this rock, he built a palace. Around it, he built what may be the most technically advanced garden complex of the ancient world. The water gardens of Sigiriya are geometrically symmetrical networks of pools, fountains, canals, and irrigation channels. The fountains, fed through the underground limestone pipes from a reservoir above, operated on a gravitational pressure and required no mechanical pump. They are activated automatically when the water level in the reservoir rises during the monsoon season, and they still work 1,500 years after they were built. The fountains remain active during the rainy season exactly as they were designed to do. The approach to the summit passed through a gateway carved in the form of an enormous lion. Only the paws survive. Each one's the height of a house, and then up a staircase cut directly into the rock. Halfway up, an open gallery ran along the western cliff face, the inner wall polished to a mirror finish so the king could watch his own reflection as he walked. The outer hall was covered in frescoes, paintings of women, possibly celestial figures, rendered in pigments whose binding agent has never been identified. Kashyapa ruled from the summit for 18 years. When Moggallana finally returned with his army in 495 AD, Kashyapa descended from the rock to fight an open battle. His war elephant changed direction to take a tactical position, his army interpreted the move as a retreat, and broke. Kashyapa drew his dagger and killed himself on the battlefield. Then Moggallana took the throne, moved the capital back to Andhra Pura, and handed Sigiriya back to the Buddhist monks. The pleasure palace became a monastery, and the fountains kept running. 1. Chandbauri, India Chandbauri is a step well. It's in the village of Abhineri in Rajasthan, in India. And the first thing you need to understand about it is that no photograph adequately communicates what it looks like. This is a structure that descends 13 stories straight down into the earth. It's about 30 meters, with 3,500 perfectly symmetrical steps arranged in a pattern across three sides of its four. The steps form an inverted pyramid, narrowing as they descend, with each row aligned to the rows above and below it to create a visual effect so mathematically exact that people encountering photographs of it for the first time frequently assume they're looking at a computer rendering. This was built in the 8th or 9th century AD by hand from stone. The purpose of it was practical. It was built to access the water table beneath the desert. Rajasthan is one of the driest regions in India, and the water table is deep below the surface. This step well was designed so that regardless of the water level, which did fluctuate dramatically between the monsoon and dry seasons, residents could always descend to reach it. But this engineering goes beyond water access. The temperature at the bottom is consistently 5 to 6 degrees Celsius cooler than the surface, so the structure functions in effect as an ancient air conditioning. Each of the 3,500 steps is identical in dimension. Each row is perfectly parallel to the rows above it and below it, and the three step faces are symmetrical to one another across the central axis. These angles are consistent from the top to the bottom across 13 stories. This was accomplished without a formal mathematical notation system and without engineered drawings as we understand them, and without the ability to stand back and see the full thing from the outside. The builders were working downward into the dark, carving a geometric pattern that could only fully be appreciated from the edge of the well looking down, a vantage point they didn't have while carving the lower levels. This structure has stood the test of time for over 1,200 years, and it is still standing, and it is still precise.