The castle’s location made it almost impregnable due to its massive cave system with an escape tunnel, a feature visitors can access during a combined castle/cave tour. Scotland has so many ...

Radiocarbon dating of the material suggested they lived there from about 29,000 to 11,000 years ago, although it is unclear precisely when the cave paintings were made.

Takamatsu Gushiken turns on a headlamp and enters a cave buried in Okinawa's jungle. He gently runs his fingers through the gravel until two pieces of bone emerge. These are from the skulls ...

Some golden-line fish have lost their scales and eyes as part of adaptations to cave life — there's no point having eyes if it's too dark to see anything. The newfound species, which the ...