Hidden beneath the surface lies a colossal marble mine unlike any other - complete with a lake inside. In this video, we explore the vast tunnels and towering marble walls of this abandoned site, ...

Shown off at FGS Live From Los Angeles, the trailer depicts an underground rainforest ten miles beneath the surface of Mars ...

New satellite technology is uncovering massive underground structures beneath the Faiyum region of Egypt, possibly linked to the legendary Labyrinth of Herodotus. Scans reveal a network of hidden ...