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.
Investigate the haunting history of the town that time forgot, unexplained circles in the New Mexico desert and a possible clue to extra-terrestrial life in the Arctic. (S5, ep 1)
Explore the mystery of the stone giant and the vanishing desert kingdom, and nukes and spooks in the Middle East. Plus, Harry Potter's Hedwig reveals her dark side. (S5, ep 3)
Learn about the mystery of the vanishing lake, toxic hell storms, CIA-trained killer monks and polar bears that stalked stricken World War II heroes. (S5, ep 4)
Explore the mystery of a sunken fleet in Maryland, weird Arctic holes that NASA cannot explain and strange structures in the desert close to Area 51. (S5, ep 5)
Learn about the hunting of Jack the Ripper from space, the battle of the big guns in the land of the Bible, the clash of the mega-beasts, and a visitation from another galaxy. (S5, ep 6)
Explore a shipwreck found in the middle of the desert, learn about the German aerial terror of WW1 and traverse through a ghost town still stalked by a serial killer. (S5, ep 7)
Investigate an electric blue mountain and the gateway to hell, the railroad of death and the town-swallowing Texan abyss. (S5, ep 8)
Witness a prehistoric ghost in Ireland, a machine that can see back in time and a giant pentagram in the Canadian snow. (S5, ep 9)
Learn about Nazis and cannibals in the Black Forest, Russia's tectonic terror weapon and Jungle guerrillas on the warpath. (S5, ep 10)
Discover terrifying new images of a blob swallowing a city, spy ships attacking America, skydiving cannibal spiders and the radioactive killer fly factory. (S5, ep 11)
Look inside America's top-secret apocalypse pyramid, explore China's hidden terror camps and see Iran's hidden terror-crater. (S5, ep 12)
Discover the desert ghost town of untold riches and unspeakable horrors, the lost empire of South America and hear mystery noises that haunt a city. (S5, ep 13)
Explore Ragnarok and the chambers of horror, see the penguin apocalypse and attack of the mega-mice and catch a family holiday - North Korean style. (S5, ep 14)
Uncover an atomic tomb, witness multi-million dollar wacky races and discover the country on fire. (S5, ep 15)
Find the billion-dollar horde buried deep beneath the deserts of Utah, discover the massacre so horrific it was captured from space and see the ice cave of the Norse fire God. (S5, ep 16)
Decode the mysterious Arizona desert cypher, discover the lair of the war elephant and beware the zombie village. (S5, ep 17)
Witness unexplained shapes in the deserts of Genghis Khan, see the mystery fleet of ice planes at the end of the Earth and look down at Kim Jong Un's terror factory from space. (S5, ep 18)
Discover the link between Nazis in New Mexico and a mystery craft in Roswell, explore Australia's underground labyrinthine abyss and decode the cypher of Atomic Island. (S5, ep 19)
Check out America's 1500 feet tall atomic tower, uncover the lost village of the damned and embark on a hunt for dinosaur fossils... from outer space? (S5, ep 20)