Science Channel's most watched series reveals Earth as it's never been seen before. Illuminating views captured by more than 4,000 orbiting satellites, `What on Earth?' investigates mysteries from strange geological occurrences to weird man-made structures. Every day, the eyes in the sky uncover new mysterious phenomena, and some defy easy explanation. To search for answers, the series combines modern imaging technology with analysis from military and intelligence professionals as well as leading scientists.
World's Deadliest Threats: Mysterious satellite images reveal China's hidden terror camps and provide access to America's top secret apocalypse pyramid. (S6, ep 1)
Monsters of Diamond Desert: Satellites capture unusual images including markings in the desert, while a strange symbol could be a portal into a lost South American civilisation. (S6, ep 2)
North Korea Death Star: Satellites capture startling images of a structure in North Korea that may be sinister evidence of a looming nuclear threat. (S6, ep 3)
Aliens of the Infinity War: Are unusual patterns in an English field really an alien message? And why is there a secret military facility in the Nevada desert? (S6, ep 4)
The Cave to Hell: Discover images of an Iceland cave that could hold alien secrets, military structures in the Utah desert and a bloody stain in the sands of Saudi Arabia. (S6, ep 5)
Terror of the Ice Snake: Discover a trail of moving objects in the ice of Antarctica, evidence of one of Joseph Stalin's most insane schemes and a code in the Sonoran Desert. (S6, ep 6)
Curse of Genghis Khan: A strange structure discovered in the Gobi Desert could reveal the whereabouts of lost treasure - changing everything we know about Genghis Khan. (S6, ep 7)
The King at Roswell: When a strange plane is discovered near the sight of the Roswell UFO incident, experts wonder if the aircraft has Nazi or extraterrestrial origins. (S6, ep 8)
Treasures of Monster Graveyard: At a mysterious site in the Gobi Desert, experts discover a monster graveyard - a groundbreaking find containing treasures of alien beasts. (S6, ep 9)
Satellites orbiting our planet have put more eyes on Earth's vast, unexplored areas of land and sea - revealing baffling new anomalies. (S6, ep 10)
Satellites orbiting our planet have put more eyes on Earth's vast, unexplored areas of land and sea - revealing baffling new anomalies. (S6, ep 11)
Satellites orbiting our planet have put more eyes on Earth's vast, unexplored areas of land and sea - revealing baffling new anomalies. (S6, ep 12)
Satellites orbiting our planet have put more eyes on Earth's vast, unexplored areas of land and sea - revealing baffling new anomalies. (S6, ep 13)
Satellites orbiting our planet have put more eyes on Earth's vast, unexplored areas of land and sea - revealing baffling new anomalies. (S6, ep 14)
Satellites orbiting our planet have put more eyes on Earth's vast, unexplored areas of land and sea - revealing baffling new anomalies. (S6, ep 15)
Satellites orbiting our planet have put more eyes on Earth's vast, unexplored areas of land and sea - revealing baffling new anomalies. (S6, ep 16)
Satellites orbiting our planet have put more eyes on Earth's vast, unexplored areas of land and sea - revealing baffling new anomalies. (S6, ep 17)
Satellites orbiting our planet have put more eyes on Earth's vast, unexplored areas of land and sea - revealing baffling new anomalies. (S6, ep 18)
Satellites orbiting our planet have put more eyes on Earth's vast, unexplored areas of land and sea - revealing baffling new anomalies. (S6, ep 19)
Satellites orbiting our planet have put more eyes on Earth's vast, unexplored areas of land and sea - revealing baffling new anomalies. (S6, ep 20)