What on Earth? - Season 3

Strange spots near the Grand Canyon may hold clues to the legendary treasure of a notorious bandit; satellite images could explain desert ruins rumored to be an entrance to an underworld; city-size chunk of ice suddenly disappears in Antarctica.

A giant carving of a strange creature suddenly appears in the Australian Outback; mysterious bright green lights illuminate the seas around Thailand; top-secret activity discovered at Iran's nuclear facility.

Strange black holes appear near Egypt's ancient pyramids, and new evidence points to a disturbing conclusion. Ruins in Peru suggests that the Inca people knew far more than previously thought. A mysterious red swarm invades a beach in India.

Legends of ancient giants surround a mysterious monument in the Holy Land. A bright pink lake could point to a strange, undiscovered new species. When a young boy disappears in a sand dune, satellite images help with the investigation.

Investigators find a new clue about the missing Malaysia Airlines flight that disappeared in 2014; an astronaut spots something strange in the Sahara Desert; a mysterious orange sludge invades a remote village in Alaska.

A buried monument offers new evidence about one of the Bible's greatest mysteries; an ominous shadow engulfs the Pacific Ocean; scientists have trouble explaining a strange lake that's shaped like a perfect circle.

A dagger sealed in King Tut's tomb for more than 3,000 years is made of a metal that seems to have extraterrestrial origins. A massive swastika is found in the desert near Roswell, NM. Satellites hunt for the world's most wanted man, Joseph Kony.

A heavily armored force takes over one of Syria's most ancient archaeology sites, prompting fears that its relics are being stolen; tanks appear to be facig off in Antarctica next to an unworldly object; a water reservoir in LA suddenly turns black.

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.

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.

A giant letter Z is carved into a Mexican hillside, evoking the mark of a legendary outlaw, Zorro; 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.

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.

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.

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

New evidence could lead to the discovery of an unknown ancient civilization in the Amazon rainforest; an island disappears and investigators are mystified; an unidentified submarine is spotted in a North Korean shipyard.

A massive chasm appears in a remote part of the Siberian forest and locals call it a gate to the underworld; images of a nuclear missile launch silo in Montana are being manipulated; a bright green spiral appears in the Persian Gulf.

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.

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.

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 spellng out a sinister message.

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.