Bizarre markings are observed from space in oceans and deserts across the planet. Strange sightings point to conspiracies that could have global repercussions.

Bizarre markings are observed from space in oceans and deserts across the planet. Strange sightings point to conspiracies that could have global repercussions.

Bizarre markings are observed from space in oceans and deserts across the planet; strange sightings point to conspiracies that could have global repercussions. This episode is a mashup of S04E18, "Forbidden City of Inca Gold", S03E15, "Lost Empire of the Amazon", and S04E05, "Mystery of Fang Forest."

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.

Bizarre markings are observed from space in oceans and deserts across the planet; strange sightings point to conspiracies that could have global repercussions. This episode is a mashup of S04E17, "Hunting the Ark of the Covenant", S03E16, "Siberian Hell Pit", and S04E04, "Beasts of the Lost Jungle."

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.

Bizarre markings are observed from space in oceans and deserts across the planet; strange sightings point to conspiracies that could have global repercussions.

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.

Bizarre markings are observed from space in oceans and deserts across the planet; strange sightings point to conspiracies that could have global repercussions. This episode is a mashup of S04E15, "Curse of Medusa", S02E05, "Curse of the Lost Kingdom", and S04E02, "Fountain of Youth Found?

New discoveries lead investigators to a crypt rumored to hold the Ark of the Covenant; when a great white shark is killed, experts suspect a mysterious ocean monster; strange markings in the desert might be a tribute to an ancient spider god.

Bizarre markings are observed from space in oceans and deserts across the planet; strange sightings point to conspiracies that could have global repercussions.

A mysterious Stonehenge-like structure in Russia may have links to the Nazis; experts uncover clues to a mega-tsunami with the power to devastate the United States; a huge lake appears in the Sahara overnight.

Bizarre markings are observed from space in oceans and deserts across the planet; strange sightings point to conspiracies that could have global repercussions. This episode is a mashup of S04E13 and S01E01.

Researchers investigate a strange glowing lake reported to turn things into stone; a structure in Africa that resembles Stonehenge is said to be the resting place of a mythical giant.

An exploration of breathtaking images and unfathomable mysteries. This episode is a mashup of S04E12 and S03E09.

An abandoned city in the African jungle may be haunted by the malevolent spirits of cannibals; Mount Vesuvius shows signs of an awakening, and the mafia could be to blame; experts investigate Adolf Hitler's secret Nazi UFO program.

An exploration of breathtaking images and unfathomable mysteries.

Man-made islands are spotted near a North Korean missile facility; an unexpected find in a remote desert leads experts to a lost city of giants; a strange discovery in Siberia suggests a secret mission to the center of the Earth.

Bizarre markings are observed from space in oceans and deserts across the planet; strange sightings point to conspiracies that could have global repercussions. This episode is a mashup of S04E10 and S02E06.

An ancient man-made volcano might reveal buried treasure and bloody human sacrifice; when NASA discovers a strange pattern in the Arctic ice, experts investigate if it has alien origins; a mystery in the Sahara might have a sinister explanation.

An exploration of breathtaking images and unfathomable mysteries. This episode is a mashup of S04E09 and S03E03.

New evidence might finally identify the hiding place of the billion-dollar Nazi gold train; a discovery of a long-lost settlement rewrites the history of the Vikings in North America; a blood-red river in Siberia points to catastrophic pollution.

An exploration of breathtaking images and unfathomable mysteries. This episode is a mashup of S04E08 and S02E01.

Evidence of human sacrifice for the Viking god Odin; shedding new light on Genghis Khan.

An exploration of breathtaking images and unfathomable mysteries. This episode is a mashup of S04E07 and S03E05.

An abandoned megacity in a remote jungle might be the home of an ancient treasure and a dark secret; when a mysterious circular stone structure is discovered in Scotland, experts investigate whether it's the fabled Round Table of King Arthur.

An exploration of breathtaking images and unfathomable mysteries. This episode is a mashup of S04E06 and S03E12.

A lost city near Jerusalem might have been the home of Goliath; bizarre underwater formations might point to a top-secret US weapons testing facility; a strange sighting in the Arctic could be a lost Nazi relic.

Bizarre markings are observed from space in oceans and deserts across the planet; strange sightings point to conspiracies that could have global repercussions. This episode is a mashup of S04E05 and S01E05.

A strange lake in Transylvania is the home of an abandoned village and a terrifying secret. When an labyrinth is discovered on an island once home to an ancient Greek civilization, experts investigate if it was the legendary home of the Minotaur.

Bizarre markings are observed from space in oceans and deserts across the planet; strange sightings point to conspiracies that could have global repercussions.

A forbidden island points to a strange South American town that locals claim was the home of Adolf Hitler. New data from NASA satellites might reveal a sunken lost continent in the Indian Ocean. A pit of bodies suggests fears of a zombie nightmare.

Bizarre markings are observed from space in oceans and deserts across the planet; strange sightings point to conspiracies that could have global repercussions.

A strange forest of razor-shape stones could be home to an undiscovered Hobbit-like humanoid species; when a man-made island mysteriously appears off the US coast, new evidence points to secret government experiments into psycho-chemical warfare.

An exploration of breathtaking images and unfathomable mysteries.

A ghost town covered in a strange, white power emerges from a lake in Argentina; upon the discovery of a lost jungle in Africa, scientists embark on a dangerous mission to explore it; a declassified CIA image uncovers a bizarre, giant Soviet weapon.

An exploration of breathtaking images and unfathomable mysteries.

A ghost ship with links to the mob suddenly appears on a California beach; strange markings could be a coded message that reveals a plot to overthrow the Queen of England; a lake believed to have magical healing powers holds clues to life on Mars.

Bizarre images observed from space shed new light on Nazi mysteries.

Bizarre markings are observed from space in oceans and deserts across the planet; strange sightings point to conspiracies that could have global repercussions.

A strange structure shaped like a giant shark might point the way to a lost civilization's fountain of youth; a massive hurricane heads toward Florida but something unexpected is in its eye; bizarre marks across the eastern U.S. leave experts baffled.

Bizarre markings are observed from space in oceans and deserts across the planet; strange sightings point to conspiracies that could have global repercussions.

Strange mounds in Transylvania might pinpoint the location of the tomb of the bloodthirsty tyrant believed to have inspired Dracula; a mysterious ancient city is discovered on a coral reef; images of a plane crash set off a hunt for a drug lord.