LOST CITIES | The Most Secret Ancient Places Hidden Inside Dense Forests | Hidden Planet Docs

In 2013, an archaeologist named Damien Evans climbed into a helicopter above the Cambodian jungle with a device that could see through trees. The device was called LiDAR. It fired pulses of light through the canopy and measured the reflections from the ground below. The technology had been used to map terrain for mining companies. Evans was using it to look for something else. The helicopter passed over a section of jungle northwest of Angkor Wat. The screen inside the cabin began drawing shapes, straight lines, right angles, grid patterns, roads, foundations. An entire city over 1,200 years old spread across the jungle floor beneath a canopy so thick that no human being walking through the forest would ever have seen it. The city was 30 square kilometers. It had been there since the 9th century. No one knew. In another part of the world, in the lowland jungle of northern Guatemala, there is a pyramid taller than any structure the ancient Maya are known to have built. The pyramid is roughly 72 meters tall. It is larger at its base than the Great Pyramid of Giza. It is covered in trees. It looks like a hill. Locals had been walking past it for centuries. They called it a mountain. It was not a mountain. It was the center of a city that had been the most powerful settlement in the Americas 2,000 years ago. And in the cloud forests of northern Peru, at an altitude of 3,000 meters, there is a stone fortress the size of a small city, surrounded by mist, accessible by a single narrow path along a cliff edge. The fortress was built by a civilization that the Inca conquered and erased from the historical record. For 500 years, the only people who knew it existed were the farmers who grew potatoes in its shadow. This is our journey through the 10 most secret ancient places hidden inside dense forests. Stay until the end, because number 1 is a city in the Guatemalan jungle so large that it was mistaken for natural terrain for over 1,000 years, and what LIDAR revealed beneath the canopy rewrote the history of the Maya civilization. Before we start, drop a comment telling us where you are watching from and what time it is right now. We want to see how many countries this video reaches. Number 10. In 1952, the Mexican archaeologist Alberto Ruz Lulier was excavating the Temple of the Inscriptions at Palenque, a Maya city in the jungle of Chiapas state. Ruz had noticed something unusual in the floor of the temple's upper chamber. The stone slabs had holes drilled in them, fitted with removable stone plugs. The holes were handles. The floor was a lid. Ruz spent four years clearing a rubble-filled staircase that descended from the chamber into the interior of the pyramid. The staircase had been deliberately sealed by the Maya with tons of stone and earth. Whatever was at the bottom was not meant to be found. At the bottom of the staircase, 25 meters below the temple floor, Ruz found a vaulted chamber. Inside the chamber was a sarcophagus weighing over 20 tons, carved from a single block of limestone. The lid of the sarcophagus was covered in an intricate carved relief showing a man falling into the open jaws of the underworld. Inside the sarcophagus was the skeleton of K'nich J'nab Pakal, the ruler of Palenque, who had died in 683 A.D. at the age of 80. His face was covered with a jade death mask. Jade ornaments surrounded the body. The chamber had been sealed for over 1,200 years. The discovery changed Maya archaeology. Until Ruz's excavation, scholars believed that Maya pyramids were solid temple platforms, not tombs. Pakal's burial proved that the Maya had built pyramids for the same reason the Egyptians had. The pyramids were graves. Palenque itself is roughly 10% excavated. According to Mexico's National Institute of Anthropology, the remaining 90% is still under jungle canopy. The city that has been studied for over a century is mostly still hidden. The temples that tourists photograph are the fraction that the jungle has released. The rest is still beneath the trees. Ruz spent four years digging through rubble to reach a room that the Maya had spent considerable effort to conceal. The Maya sealed Pakal's tomb because the dead were not meant to be visited. Ruz visited anyway. The jade mask is now in the National Museum of Anthropology in Mexico City. The tomb is open to tourists. The king who was buried in secret is now one of the most famous figures in pre-Columbian history. The jungle that hid him for 12 centuries was not consulted about the decision to reveal him. 9. Sigiriya, Sri Lanka In the 5th century AD, a Sri Lankan prince named Kashyapa murdered his father, seized the throne, and then did something that no other king in the ancient world is known to have done. He moved his entire court to the top of a 200-meter granite column rising from the jungle floor and built a palace on the summit. According to the Mahavamsa, the ancient chronicle of Sri Lankan history, Kashyapa was the illegitimate son of King Datusena. He killed his father in 477 AD and drove his half-brother Moggallana into exile in India. Fearing Moggallana's return with an army, Kashyapa abandoned the traditional capital of Anuradhapura and relocated to Sigiriya, a massive rock formation in the central jungle. The construction was extraordinary. A staircase was carved into the rock face. Halfway up, the stairs passed through the chest of a colossal lion carved into the cliff. Only the lion's paws survive today. They are each over 3 meters tall. The palace on the summit included gardens, pools, and a throne room with views extending to the horizon in every direction. An enemy approaching from any direction would have been visible hours before arrival. At the base of the rock, Kashyapa built one of the most sophisticated water garden systems in the ancient world. According to UNESCO, which designated Sigiriya a World Heritage Site in 1982, the gardens included symmetric pools, fountains operated by hydraulic pressure, and an irrigation system that still functions during the monsoon season, 1,500 years after it was designed. Kashyapa ruled from Sigiriya for 18 years. In 495 AD, Moggallana returned with an army from India. According to the Mahavamsa, Kashyapa rode out to meet his brother in battle on the plains below the rock. During the battle, his elephant turned to avoid a marsh. His troops interpreted the turn as a retreat. They fled. Kashyapa, abandoned on the field, drew his sword and cut his own throat. Moggallana took the throne. He abandoned Sigiriya and returned the capital to Anuradhapura. The palace on the rock was given to Buddhist monks as a monastery. The monastery was eventually abandoned. The jungle reclaimed the base. The gardens flooded. The lion staircase crumbled. The rock stood empty for over a thousand years until British colonial archaeologists rediscovered it in the 1830s. A king built a fortress on top of an impossible rock because he was afraid his brother would come to kill him. His brother came. The fortress did not save him. The rock outlasted the fear that put a palace on its summit. Number 8. Great Zimbabwe In the southeast of Zimbabwe, in a region of dry woodland and granite hills, there is a stone city. The walls are over 11 meters tall. They are made of granite blocks fitted together without mortar. The blocks are cut so precisely that the joints are barely visible. The outer wall of the great enclosure is over 250 meters long. It is the largest ancient stone structure in sub-Saharan Africa. Great Zimbabwe was built between the 11th and 15th centuries by the ancestors of the modern Shona people. According to archaeological research published by the University of Zimbabwe and confirmed by international studies, the city was the capital of a trading empire that controlled the gold trade between the interior of southern Africa and the Swahili coast. At its peak, the city housed over 18,000 people. Artifacts recovered from the site include Chinese ceramics, Persian glass, and Arab coins, confirming trade connections spanning thousands of kilometers. When European colonizers encountered the ruins in the 19th century, they refused to believe that Africans had built them. According to historical records, Cecil Rhodes and the British South Africa Company promoted the theory that the ruins were the work of Phoenicians, Arabs, or a lost white civilization. The colonial government of Rhodesia, which took its name from Rhodes, maintained this position as official policy for decades. Archaeologists who published evidence of African authorship were censored. Some lost their positions. The racist theories were definitively disproven by multiple independent archaeological studies in the mid-20th century. Radiocarbon dating confirmed the construction timeline. Artifact analysis confirmed local manufacture. The architecture matches Shona building traditions documented elsewhere in the region. The evidence is unambiguous. The city was built by Africans for Africans using African engineering. The country that was named after the man who denied African achievement eventually renamed itself after the achievement itself. Rhodesia became Zimbabwe in 1980. The name Zimbabwe comes from the Shona phrase Zim-ba-za-ma-bwe, houses of stone. The stone houses that a colonial empire tried to erase from African history became the name of the nation that replaced the colonial empire. 7. Cuelap, Peru In the cloud forests of northern Peru, at 3,000 meters above sea level, there is a fortress larger than Machu Picchu. The walls are over 20 meters tall. The complex covers roughly six hectares. It was built by the Chachapoyas, a civilization that the Inca called the Warriors of the Clouds. According to the Peruvian Ministry of Culture, Cuelap was constructed between the 6th and 16th centuries. The walls are made of limestone blocks stacked without mortar. The total volume of stone used in the construction exceeds that of the Great Pyramid of Giza. The entrance is a narrow corridor that funnels down to a passage barely wide enough for one person. A single defender in the corridor could hold off an army. The Chachapoyas were conquered by the Inca Empire in the 1470s. The Inca absorbed Chachapoyas warriors into their military. When the Spanish arrived in the 1530s, the Chachapoyas initially sided with the Conquistadors against their Inca overlords. The alliance did not save them. Spanish diseases and colonial violence reduced the Chachapoyas' population from roughly 300,000 to less than 10,000 within a century. Cuelap was abandoned. The cloud forest consumed it. The walls disappeared beneath moss, vines, and tree roots. The fortress was rediscovered in 1843 by a local judge named Juan Crisostomo Nieto, who was exploring the area on horseback. Nieto reported the finding. The report was filed and forgotten. Systematic archaeological investigation did not begin until the 20th century. In 2017, a cable car was built connecting the valley floor to the fortress. The cable car reduced the approach from a six-hour hike to a 20-minute ride. Tourism exploded. According to Peruvian tourism statistics, visitor numbers increased from roughly 30,000 per year to over 100,000 within two years. The Warriors of the Clouds built a fortress in the mist. The Inca conquered them. The Spanish destroyed them. The cloud forest hid their fortress for three centuries. A cable car revealed it to the world. The civilization that built Cuelap is gone. The stone they cut is still standing. The clouds are still there. 6. Caracol, Belize In the jungle of western Belize, there is a Maya city that was larger than the modern capital of the country. Caracol covered roughly 200 square kilometers. At its peak around 650 AD, it housed over 150,000 people. The central pyramid, Kana, meaning Sky Palace, is still the tallest man-made structure in Belize at over 43 meters. Caracol was discovered in 1937 by a logger named Rosa Mai, who reported finding large stone structures in the jungle. Archaeological work began in 1950 but progressed slowly due to the extreme remoteness of the site. The road to Caracol, even today, is a rough dirt track that takes over two hours to drive from the nearest town. In 562 AD, Caracol did something that no one expected. According to a carved altar stone discovered at the site in 1986, Caracol attacked and defeated Tikal, the most powerful Maya city of the era. The victory text, called the Caracol Altar 21, records a military event called a Star War against Tikal. The defeat plunged Tikal into a century-long decline. Caracol became the dominant power in the central Maya lowlands. The Star War glyph has been interpreted by epigraphers as referring to a specific type of total war, involving the destruction of the enemy's patron deity shrine. According to research by archaeologist Diane Chase of the University of Nevada, the defeat of Tikal by Caracol shifted the political balance of the Maya world for over 100 years. The city that defeated the greatest Maya power in history was found by a logger. The altar that recorded the victory was not read until 1986. For over a thousand years, the story of one of the most significant military victories in pre-Columbian history was sitting in the jungle, carved in stone, waiting for someone who could read the glyphs. 5. Vilcabamba, Peru When the Spanish conquered the Inca Empire in the 1530s, a section of the Inca royal family escaped into the jungle. They established a new capital in a location so remote that the Spanish spent nearly 40 years trying to find it. The city was called Vilcabamba. The last Inca emperors ruled from there until 1572, when the Spanish finally captured and executed the last emperor, Tupac Amaru. After 1572, the location of Vilcabamba was lost. The Spanish recorded vague descriptions of the route through the jungle, but the descriptions were contradictory. Expeditions in the following centuries searched for the city without success. In 1911, Hiram Bingham was looking for Vilcabamba when he was led to Machu Picchu instead. Bingham initially believed Machu Picchu was Vilcabamba. He was wrong. The actual site of Vilcabamba was identified in 1964 by the American explorer Gene Savoy. According to Savoy's account, he followed a combination of colonial Spanish descriptions and local Quechua knowledge to a site called Espiritu Pampa, deep in the jungle of Cusco province. The site contained massive stone platforms, fountains, and over 300 buildings overgrown with vegetation. Subsequent archaeological work confirmed the identification. Espiritu Pampa was Vilcabamba. The ruins are still largely unexcavated. The jungle access takes multiple days on foot. Unlike Machu Picchu, which receives over a million visitors per year, Vilcabamba receives fewer than a thousand. The last capital of the Inca Empire, the place where an entire civilization made its final stand, sits in the jungle almost exactly as Savoy found it 60 years ago. Bingham found the wrong city and made it the most famous archaeological site in South America. Savoy found the right city and almost no one has heard of it. Machu Picchu was a royal estate. Vilcabamba was the last refuge of an empire. The estate became a global icon. The refuge remains in the jungle. We are halfway through and the cities ahead are larger, older, and more hidden than anything we have seen so far. The next city was the rival of Caracol and Tikal, controlled tens of thousands of people and was so deep in the Mexican jungle that its discovery in 1931 was not followed up for 50 years. Number 4. Calakmul, Mexico. In the Yucatan jungle of southeastern Mexico, roughly 35 km from the Guatemalan border, there is a Maya city that controlled an empire. The city is Calakmul. At its peak around 600 AD, the kingdom of Calakmul dominated the southern Maya lowlands. The rivalry between Calakmul and Tikal defined Maya geopolitics for centuries. Calakmul was the other superpower, and almost no one outside of archaeology has heard of it. According to research published by the National Autonomous University of Mexico, Calakmul contains over 6,000 structures spread across roughly 70 square kilometers. The central pyramid, Structure 2, is over 45 meters tall and is one of the largest Maya pyramids ever built. The city contained a population estimated at over 50,000. Calakmul was discovered in 1931 by the American botanist Cyrus Lundell, who was surveying the jungle for commercially valuable chicklea trees. Lundell reported the ruins. The report generated academic interest, but the site was so remote and the jungle so dense that no major archaeological excavation began until the 1980s. In the 2010s, LiDAR surveys revealed that the area surrounding the known ruins contained thousands of additional structures that had been invisible beneath the canopy. According to research led by the National Institute of Anthropology and History, the greater Calakmul region supported a population far larger than previously estimated. The city was not an isolated center. It was the hub of a network of satellite communities connected by raised roads called saqbiyab that extended for kilometers through the jungle. The Maya built raised roads through the jungle to connect their cities. The jungle erased the roads. LiDAR found the roads. The civilization that built them has been gone for over a thousand years. The technology that revealed them was invented less than 20 years ago. The jungle had been keeping the secret for the entire interval. 3. El Mirador, Guatemala The largest pyramid in the Maya world is not at Tikal. It is not at Chichen Itza. It is at a site called El Mirador in the Paten jungle of northern Guatemala, and it is still mostly covered in trees. La Danta, the main pyramid at El Mirador, stands roughly 72 meters tall. Its base covers approximately 18,600 square meters. In terms of total volume, La Danta is one of the largest pyramids ever built anywhere on Earth, comparable to the Great Pyramid of Giza. The construction has been dated to approximately 300 B.C., making it over 2,300 years old. According to research led by archaeologist Richard Hansen of Idaho State University, El Mirador was the capital of the first Maya state. The city flourished from roughly 600 B.C. to 100 A.D., predating the classic Maya period by centuries. At its peak, the city housed over 100,000 people. The road system connecting El Mirador to surrounding cities was built with raised limestone causeways over 17 meters wide. El Mirador collapsed around 150 A.D. The reasons are debated. Drought, deforestation, and political instability have all been proposed. The population dispersed. The jungle consumed the city. The pyramids became hills. The causeways became ridges. Today, reaching El Mirador requires a two-day hike through dense jungle from the nearest road. There is no other access. Helicopter landing is possible, but restricted. The site has no permanent infrastructure for visitors. The archaeologists who work there camp in the jungle during excavation seasons. La Danta has been partially cleared of vegetation on one face. From the summit, the view extends across unbroken jungle canopy to the horizon. The canopy hides additional cities, additional pyramids, and additional causeways that LIDAR has revealed but no one has yet excavated. The largest pyramid in the Americas has been standing for over 2,000 years. For most of that time, no one knew it was a pyramid. It looked like a hill. The trees grew on it. The birds nested in them. The archaeologists who cleared one face of the pyramid revealed a structure that the civilization which built it never intended to hide. The jungle hid it anyway. The jungle has been doing this across the entire Maya lowlands for over 1,000 years. El Mirador is the largest thing it has hidden. It is almost certainly not the last. 2. Mahindra Parvata, Cambodia In 2012, a helicopter carrying an archaeologist and a LIDAR device flew over a section of jungle on the slopes of Phnom Kulen, a forested plateau roughly 40 kilometers northeast of Angkor Wat. The archaeologist was Damien Evans of the University of Sydney. The LIDAR fired millions of laser pulses through the canopy. The pulses passed between the leaves, hit the ground, and bounced back. The computer assembled the reflections into a three-dimensional map of the terrain beneath the trees. The map showed a city. According to Evans' research, published in the Proceedings of the National Academy of Sciences, the city was approximately 30 square kilometers in extent. It contained a grid of roads, canals, reservoirs, and building foundations arranged in a deliberate urban plan. The city predated Angkor Wat by approximately 350 years. It was, according to inscriptions found at the site, the capital established by Jayavarman II in 802 AD, the king who founded the Khmer Empire and declared himself a god-king. The city was called Mahindra Parvata. The discovery was revolutionary because Mahindra Parvata was the city from which the Angkor civilization originated. Historians had known from inscriptions that Jayavarman II established his capital on Phnom Kulon. They had been unable to find it. The jungle was too dense for ground surveys. The terrain was too flat for the city plan to be visible from the surface. A person walking through the forest would see only trees, mud, and occasional mounds. They would not see the city they were standing in. LiDAR saw everything – the canals, the roads, the reservoirs, the foundations of a royal palace complex. The geometry of a planned city laid out 1,200 years ago by engineers who understood hydraulic management, urban planning, and large-scale construction. The city was not primitive. It was sophisticated. It was simply invisible. Mahindra Parvata was found by technology that the Khmer engineers could not have imagined. They built a city. The jungle covered it. Twelve centuries passed. A helicopter flew over with a laser. The laser saw through the trees. The city reappeared. The engineers who designed it were dead before the first European arrived in Southeast Asia. Their city outlasted every attempt to find it until the moment someone stopped looking with human eyes and started looking with light. Before we reveal number 1, the next video on this channel will take you somewhere even more impossible. The button is right there. Number 1. Tikal, Guatemala. And now, the city that the jungle kept for a thousand years. In the lowland jungle of northern Guatemala, rising above the canopy of the Patan rainforest, the limestone pyramids of Tikal stand like watchtowers over a sea of green. Temple 4, the tallest structure at the site, reaches 70 meters above the jungle floor. From the summit, the view extends to the horizon in every direction. Nothing but trees. No roads. No cities. No sign that the 21st century exists. Only jungle and the tops of other pyramids breaking through the canopy like the fins of submerged animals. Tikal was one of the largest and most powerful cities in the ancient Maya world. According to research published by the University of Pennsylvania, which conducted excavations at the site from 1956 to 1970, the city at its peak around 700 AD housed a population estimated between 60,000 and 100,000 people. The urban center covered approximately 16 square kilometers. The surrounding agricultural hinterland extended far beyond. The city was governed by a dynasty called the Mutal, whose emblem glyph has been identified on stele and altar stones across the Maya lowlands. The Mutal dynasty fought wars with Calakmul, Karakol, and smaller city-states for centuries. The wars were documented in carved stone monuments. The victories were celebrated with the sacrifice of captured rulers. Around 900 AD, Tikal was abandoned. The abandonment was not sudden. Archaeological evidence suggests a gradual decline over roughly a century. The population decreased. Construction ceased. The last dated monument at Tikal was carved in 869 AD. After that date, no new stone was carved. No new building was built. The city emptied. The cause of the Maya collapse remains one of the most debated questions in archaeology. According to research published by the journal Science in 2012, a severe drought lasting over a century coincided with the abandonment of Tikal and other lowland Maya cities. The drought reduced water availability in a region entirely dependent on seasonal rainfall. The reservoirs at Tikal, which had sustained the city for centuries, ran dry. The population could not be fed. The political system that had held the city together disintegrated. The jungle began reclaiming Tikal within decades of the abandonment. Trees grew in the plazas. Roots split the limestone staircases. The pyramids disappeared beneath the canopy. By the time Spanish conquistadors passed through the Paten in the 17th century, Tikal was invisible. The Spanish walked through the jungle without knowing a city of 100,000 people had stood there 700 years earlier. Tikal was rediscovered in 1848 by a Guatemalan expedition led by Modesto Mendez and Ambrosio Tut, a local Chiclero who knew the area. The expedition reported massive stone structures emerging from the jungle. The report attracted international attention. Archaeological work began in the late 19th century and continued through the 20th. In 1977, George Lucas filmed a scene for Star Wars at Tikal. The shot, used at the end of the original film, shows the rebel base as a series of pyramid tops rising above a jungle canopy. The pyramids were real. The jungle was real. The rebel base was Tikal. Millions of moviegoers saw the Maya city without knowing they were looking at one of the greatest archaeological sites on Earth. In the 2000s and 10s, LiDAR surveys of the area surrounding Tikal revealed something that changed the scale of understanding. According to research published in Science by a team led by Marcello Canuto of Tulane University, the jungle surrounding Tikal contained over 60,000 previously unknown structures. Houses, terraces, defensive walls, causeways, and agricultural features extended across an area far larger than the known city center. The population estimates were revised upward dramatically. Tikal was not a city of 100,000. The greater Tikal region may have supported over 10 million people at the height of Maya civilization. In a jungle that the modern world considered mostly empty, the Maya built a civilization in the lowland tropics that rivaled contemporary civilizations in Europe and Asia. They did it without metal tools, without the wheel, without draft animals. They built pyramids taller than anything in the European Middle Ages. They developed a writing system, a calendar system, and astronomical knowledge that modern scientists have confirmed is accurate. And then they left. The drought came. The water ran out. The population that the jungle had supported could no longer be fed. The cities emptied. The jungle consumed them. The pyramids became hills. The roads became trails. The plazas became forest floors. Tikal stood hidden for over a thousand years. When it was found, the pyramids were still there. The stelae were still carved. The reservoirs were still dry. And the jungle, which had hidden the city for a millennium, continued to hold the rest of it beneath the canopy, waiting for a laser fired from a helicopter to see what the trees had been covering since before the first European arrived in the Americas. The most secret ancient place hidden inside a dense forest is not secret because someone hid it. It is secret because the forest did what forests do. It grew. And beneath the growth, the largest civilization in the pre-Columbian Americas was waiting to be found. Ten cities. Seven countries. And ten versions of the same question that every forest on Earth has been answering since the first stone was laid and the first tree grew over it. What is under there? A Maya king buried in a pyramid for 1,200 years in Mexico? A palace on a granite column in Sri Lanka built by a king who killed his father and then himself? The largest stone city in Africa, denied by the empire that found it? A cloud forest fortress built by warriors the Inca erased from history? A Maya city in Belize that defeated the greatest power of its age? The last capital of the Inca empire that took 400 years to find? A Maya superpower hidden beneath the Mexican jungle until LiDAR revealed its roads? The largest pyramid in the Americas, still covered in trees in Guatemala? A Khmer capital invisible for 12 centuries until a laser saw through the canopy? And a city in the Guatemalan jungle where 10 million people lived, vanished, and were swallowed by the forests they had farmed? Which lost city would you want to explore? Tell us in the comments. And if you made it to the end, you already know this channel is for you. We will see you in the next video.