What On Earth?

Investigators find a new clue about the missing Malaysia Airlines flight that disappeared in 2014, and an astronaut spots something strange in the Sahara Desert. (S3, ep 5)

An ominous shadow engulfs the Pacific Ocean and scientists have trouble explaining a strange lake that's shaped like a perfect circle. (S3, ep 6)

A dagger sealed in King Tut's tomb for over 3,000 years is made of a possibly extraterrestrial metal. A huge swastika is found in the desert near Roswell. (S3, ep 7)

The face of Christ is discovered in a field in Hungary and a photo that claims to show who shot down a passenger jet in Ukraine. (S2, ep 5)

We investigate one natural phenomenon, four shapes that resemble human origin and monitor one example of human origin and current destruction. (S2, ep 6)

Satellite images could explain desert ruins rumoured to be an entrance to an underworld and a city-sized chunk of ice suddenly disappears in Antarctica. (S3, ep 1)

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)

When mysterious structures are discovered deep in a remote forest, experts investigate if this strange site was the long-lost birthplace of a top-secret Nazi project. (S7, ep 1)

A ghost town covered in a strange, white power emerges from a lake in Argentina and a declassified CIA image uncovers a bizarre, giant Soviet weapon. (S4, ep 4)

When a man-made island mysteriously appears off the US coast, grisly new evidence points to secret government experiments into psycho-chemical warfare. (S4, ep 5)

A forbidden island points to a strange South American town that locals claim was the home of Adolf Hitler and a pit of bodies suggests fears of a zombie nightmare. (S4, ep 6)

A ghost ship is found abandoned on a remote island that's home to one of the world's last uncontacted tribes. (S4, ep 19)

Bizarre underwater formations might point to a top-secret US weapons testing facility and a strange sighting in the Arctic could be a lost Nazi relic. (S4, ep 8)