Inside, rough stone walls line passageways and rooms, reminding visitors that they are just as much in a castle as they are in the body of, essentially, a huge rock.

That’s when a 200-foot passage was dug through the back of the cave and a parallel tunnel was blasted through adjacent rock. You can still see the original “cave” part of the tunnel in the rough rock ...

Well, if you've clicked on this story, you already know a little bit of what you're in for. But the cave house of Glenwood Springs is more than meets the eye, and we'll take you inside to show you ...

Archaeologists inside Cueva de Ardales Ramos-Muñoz et al., CC-BY 4.0 In 1821, an earthquake rocked southern Spain and, in the process, exposed the entrance to Cueva de Ardales, a previously ...

More than 57,000 years ago, a human traced their fingertips along the chalky wall of a French cave, leaving shallow, parallel furrows behind. But what species were they?

Ancient Cave Drawings and Early Human Language Linked in New Study. Sound echoing within caves may have also influenced what early humans put on rock walls.