In Mexico, a rancher discovers dozens of skulls and bones on a cave floor.

On the island of Kolombagara, explorers uncover a mysterious man-made cave.

A puzzling site containing large stone blocks is revealed on Kilwa Island.

A mysterious creature that glows in the dark is discovered at Lake Eacham.

Explorers discover ancient structures hidden on the island of Pohnpei.

In the Philippines, archaeologists discover ancient rhinoceros remains.

In Colombia, a team of scientists discover an unidentified animal vertebra.

Scientists discover a fossil unlike any known animal, living or extinct.

Experts investigate a structure built above the rain forests of Sri Lanka.

Archaeologists identify a series of unknown structures in Guatemala.