What on Earth?

Strange mounds in Transylvania might pinpoint the location of the tomb of Vlad the Impaler. A mysterious ancient city is discovered on a coral reef. Images of a plane crash sets off a hunt for a drug lord.

A structure shaped like a giant shark might point to a lost civilization's Fountain of Youth. Then, a massive hurricane heading toward Florida also brings something unexpected, and bizarre marks across the US baffle experts.

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 shimmering lake may hold clues to life on Mars.

A ghost town covered in a strange, white powder emerges from a lake in Argentina. Scientists embark on a dangerous mission to explore a lost jungle in Africa. A declassified CIA image uncovers a bizarre Soviet weapon.

A strange forest of razor-sharp stones could be home to an undiscovered Hobbit-like humanoid species. When a man-made island mysteriously appears off the US coast, grisly new evidence points to secret government experiments.

Locals claim a strange South American town was the home of Adolf Hitler. New data from NASA satellites might reveal a sunken continent in the Indian Ocean. A pit of bodies suggests fears of a zombie nightmare in medieval England.

A strange lake in Transylvania hides an abandoned village -- and a terrifying secret. Experts investigate if an ancient labyrinth was the legendary home of the Minotaur.

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

An abandoned megacity in a remote jungle might be the home of an ancient treasure and a dark secret. A mysterious circular stone structure in Scotland may be the fabled Round Table of Arthurian legend.

An ancient network of tunnels beneath the English countryside contains evidence of human sacrifice for the Viking god Odin, and an abandoned fortress in Siberia might shed new light on Genghis Khan.

New evidence may finally reveal the hiding place of Hitler's billion-dollar gold train. A long-lost settlement rewrites the history of the Vikings in North America. A blood red river points to catastrophic pollution.

An ancient volcano might reveal buried treasure and bloody human sacrifice. Experts investigate if a strange pattern in the Arctic ice has alien origins. A mystery in the Sahara may have a sinister explanation.

Man-made islands are spotted near a North Korean missile facility. Experts investigate a city of giants in the middle of a remote desert. A strange discovery in Siberia could reveal a secret mission to the center of the Earth.

An abandoned city in the Kenyan jungle might have a bloody past of malevolent spirits and cannibals. Mount Vesuvius shows signs it's awakening, and the mafia could be to blame. Experts investigate a secret Nazi UFO program.

Experts investigate a strange glowing lake reported to turn things into stone. A mysterious structure in Africa is said to be the resting place of a mythical giant. A dark conspiracy could be at work in the Australian outback.

A mysterious structure in Russia might have links to the Nazis. Experts uncover clues to a mega-tsunami with the power to devastate the US. A huge lake appears in the Sahara overnight, and its explanation could be mythical.

New discoveries lead investigators to a crypt rumored to hold the Ark of the Covenant. Experts hunt for a mysterious ocean monster. Strange markings in the desert might be a tribute to an ancient spider god.

New technology might finally locate the untold riches of a lost Inca city. A strange mountain in Egypt sparks an investigation into Cleopatra's gems and the tomb of Alexander the Great.

A 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. A mysterious compound is located in Russia.

New evidence might reveal how the Maya vanished. Scientists discover traces of ritualistic drug binges from the ancient world. A mysterious symbol in the desert points to a millionaire sex cult.