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The myth of Merlin is associated with an arrangement of stones in northern France; satellite images might finally explain this ancient riddle; Investigators uncover something mysterious buried beneath the Gulf of Mexico.

What on Earth?

The Curse of Merlin

A young boy makes international headlines when he uses satellite images to discover lost cities of the Maya; satellite images might point to a modern-day genocide; trees in China seem to be spelling out a sinister message.

Forbidden Cities of the Maya

New evidence could reveal the remains of an ancient Roman city thought to be lost forever; strange images from a remote and empty desert could explain the mysterious mummies found there; an apocalyptic sandstorm swallows the Middle East.

Mystery of the Mummy Desert

Strange images from the jungles of Colombia could lead researchers to the legendary city of El Dorado; a bright green swirling spiral appears in the seas of the Persian Gulf; a massive complex suddenly appears in Myanmar.

Hunt for El Dorado

A massive chasm appears in a remote part of the Siberian forest.

Siberian Death Pit

New evidence could lead to the discovery of an unknown ancient civilization in the Amazon rainforest; a strange photo reveals a massive Arctic canyon buried beneath the ice; an unidentified submarine is spotted in a North Korean shipyard.

Lost Empire of the Amazon

A vast structure buried in the sands near the legendary city of Petra points to a bloody past; when terrorists kidnap more than 200 schoolgirls in northern Nigeria, rescuers use satellites to track them down.

Bloody Secret of the Lost City

An amateur archaeologist finds strange symbols scratched into the Kazakhstan desert; CIA surveillance photographs show what appears to be a giant Star of David on the island of Cuba; a lake in the Brazilian rain forest turns bright pink.

Strange Symbols in the Desert

A strange mass breaches surface of an ocean near Antarctica, sparking rumors of a mythological sea monster; an area of the US-Mexico border becomes an international mystery; ancient rock carvings in a remote mountain range depict unearthly beings.

Curse of the Sea Monster

A giant letter Z is carved into a Mexican hillside, evoking the mark of a legendary outlaw; a strange sighting in Germany points to secrets from the Cold War; Massive, blood-red marks in China prompt fears of a violent government crackdown.

Ghost of Zorro

Satellite images reveal how El Chapo escaped from a high security prison in Mexico; mysterious patterns in the Australian outback and the Kalahari Desert spark a major scientific investigation; a giant black stain appears in a war-torn area of Iraq.

Inside El Chapo's Escape

A giant swastika appears in a forest in Germany; a strange pattern is etched into the desert near the famous Nazca lines, but archaeologists don't know who put it there; mysterious markings are spotted in an isolated corner of Antarctica.

The Swastika Conspiracy

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Modern imaging technology and analysis from military and intelligence professionals, as well as leading scientists, investigate mysteries from strange geological occurrences to weird man-made structures as seen by more than 4,000 orbiting satellites.

S3 E20 | The Curse of Merlin