What on Earth?

Satellite images capture a bizarre pattern of enormous circular clouds obscuring an island in the eastern Atlantic; experts investigate and uncover evidence of an unfolding natural disaster that could potentially threaten millions of lives.

Aerial archaeologists use laser imaging to capture a distinct star-shaped pattern carved into the marsh of a Florida swamp; experts investigate and reveal a lost Civial War fort linked to an extraordinary community with a tragic past.

Satellite images capture a large compound of abandoned structures that are overgrown with vegetation in Indiana; experts investigate and uncover a derelict WWII munitions factory that played a crucial role in US military history.

Aerial drone imaging captures a circular man-made structure that appears to be centuries-old in the remote forests of Aydin, Turkey; experts investigate and discover a lost ancient amphitheater with a history steeped in gladiatorial bloodshed.

Satellite images capture a mysterious fortification concealed beneath a patch of woodland in the remote stretches of Norfolk, England; experts investigate and uncover rival royal families and a lost castle destroyed during a medieval blood feud.

Satellite images capture miles of aircraft precisely arranged in the vast Arizona desert; experts investigate and uncover the largest aircraft storage facility on Earth and the rotting remains of a defining moment in Cold War history.

Satellite images capture an enormous X shape mysteriously carved with precision in the remote Nevada desert; experts investigate and uncover a military emergency landing field linked to one of the most astonishing test programs in aviation history.

Satellite images reveal a mysterious vessel that suddenly appears marooned on a remote stretch of Ireland's southern coast; experts investigate and uncover a bizarre journey near the Bermuda Triangle that resulted in a US Coast Guard interception.

Satellite images capture a mysterious group of pyramid-shaped structures in the arid, desert landscape of Arizona. Experts investigate and uncover a highly controversial research facility designed to prepare humanity for life on another world.

Satellites capture a series of dots buried in Norway's frozen landscape.