Treasure hunters have searched for a lost Incan city of untold wealth for a century, but new technology might finally locate its riches. A strange mountain in Egypt sparks an investigation into Cleopatra's gems and the tomb of Alexander the Great.

A ghost ship is found abandoned on a remote island that's home to one of the world's last uncontacted tribes. A strange labyrinth in Sicily might have a sinister connection to the Mafia. New evidence reveals a mysterious military compound in Russia.

New evidence might reveal how the Mayans vanished. When scientists investigate an abandoned settlement, they discover traces of ritualistic drug binges from the ancient world. A mysterious symbol in the desert points to a sex cult of millionaires.

Something strange in the Himalayas could be evidence of a top-secret CIA program to turn monks into killer agents, and cutting-edge science helps experts investigate the truth behind this mysterious anomaly.

A satanic symbol points to an army of the dead in Siberia. A massive stone giant in a remote desert. Evidence of a Russian doomsday device right on America's doorstep. Cutting-edge technology helps experts answer these sinister mysteries from space.

Zombie reindeer haunting the mountains of Norway. Strange circles in the sand by a secret US military base. A gigantic streak in the Arctic pointing towards alien life. Cutting-edge technology helps experts answer these sinister mysteries from space.

A fleet of sunken ships point to ghosts, cannibals, and bloodshed in early America. Strange Arctic holes that NASA can't explain. Near Area 51, mysterious alien structures straight out of Star Wars. Cutting-edge technology helps experts investigate.

New discoveries from space give experts new clues in the hunt for Jack the Ripper. When a strange object lands in Antarctica, experts speculate it could be an alien visitor. Cutting-edge tech helps experts answer these sinister mysteries from space.

Hundreds of shipwrecks in the middle of a desert in Africa. A ghost town where hundreds of its inhabitants have mysteriously died. Something strange in North Korea. Cutting-edge tech helps experts answer these sinister mysteries from space.

A site that could be the Garden of Eden hides a deadly secret. When a gateway to hell suddenly opens, experts investigate where it leads. A mysterious shipwreck could be an infamous Soviet KGB pirate ship.

Evidence of a mysterious 5,000-year-old structure suddenly appears in Ireland. A top-secret machine that can see back in time. A satanic pentagram in the snow that points to witchcraft in the New World.

A strange circular forest next to a notorious cannibal site. When a crater is spotted in Siberia, experts uncover if it could be evidence of Nikola Tesla's doomsday device. Cutting-edge tech helps experts answer these sinister mysteries from space.

The world's most dangerous threats are in top-secret locations all over the planet, and using cutting-edge technology, experts reveal the truth behind these sinister mysteries from space.

Some of the world's most incredible engineering projects are now deserted. Revisit a Soviet megastructure, a massive Nazi brainwashing complex, and a dangerous desert pass. How were they built? Why were they mysteriously abandoned?

Some of the world's most incredible engineering projects are now deserted. Explore a ghost town that was once a dangerous industrial hellscape, a giant warship at the bottom of the ocean, and a top secret relic from the Cold War.

Some of the world's most incredible engineering is now deserted. Explore what happened to the town located outside of Chernobyl on the eve of disaster, a fleet of ghost ships, and a dangerous mountain road that changed history.