What on Earth?

Satellite images capture a bizarre pattern of enormous circular clouds obscuring the Spanish island of La Palma in the eastern Atlantic. Experts investigate the 2021 Cumbre Vieja volcanic eruption 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 Civil War fort linked to an extraordinary community with a tragic past.

Satellite images capture a large compound of abandoned structures overgrown with vegetation in Clark County, Indiana. Experts investigate and uncover the Indiana Ordnance Works, a derelict WWII munitions factory that played a crucial role in US military history, producing smokeless gunpowder. In 1964, its name changed to the Indiana Army Ammunition Plant.

Aerial drone imaging captures a circular man-made structure that appears to be centuries-old in the remote forests of Aydin Province in western Turkey. Experts investigate a lost ancient Roman 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 rival royal families and Gresham Castle, a lost castle destroyed during a medieval blood feud.

Satellite images capture miles of aircraft precisely arranged in the vast Arizona desert. Experts investigate 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 a military emergency landing field linked to one of the most astonishing test programs in aviation history.

A ghost ship appears overnight on the shores of Ireland. Could it help shed light on the fate of vessels claimed by the most notorious patch of ocean on earth?

Satellite images capture a mysterious group of pyramid-shaped structures in Arizona's arid, desert landscape. Experts investigate Biosphere 2, a highly controversial research facility designed to prepare humanity for life on another world.

Aerial archaeologists capture a series of mysterious dots buried beneath the remote, frozen landscape of Finnmark, Norway. Experts investigate and reveal revolutionary reindeer hunting techniques using trapping pits developed by the Sámi, the oldest surviving indigenous Norwegian tribe.