What on Earth? Season 10: Episode Guide & Ratings

Satellite images capture a giant symbol mysteriously carved into the expanse of Australia's Great Victoria Desert; an investigation reveals a secret nuclear weapons-testing cover-up by the British government with numerous aboriginal casualties.

Satellites capture bizarre circular structures in the forests of England.

Satellites capture mysterious stone objects across the Arizona mountains.

Satellites capture a castle-like structure hidden in Scottish woodlands.

Satellites capture rocks in the shape of a fingerprint on a Swedish island.

Satellites capture a bizarre pattern of circles in a remote English forest.

Aerial imaging captures a complex of ancient Roman buildings in Yorkshire.

Satellites capture a gigantic oval carved into the forests of New Jersey.

Satellites capture a mysterious collection of ghost towns in Belarus.

Satellites capture a cone-like structure in the mountains of Turkey.