Jewel Cave, located 13 miles west of Custer, has more than 208 miles of “mapped and surveyed passage ways,” with hundreds of suspected passages yet to be explored, according to the National Park ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. SAN DIEGO — Southern California is home to ...

Pennsylvania hides an underground river that continues far beyond what anyone has mapped, shrouded in mystery.

Beneath the United States lies a surprising network of caves shaped over millions of years. Some feel almost otherworldly, with strange rock formations and the occasional glow from naturally occurring ...

The first person to peer into the 18-inch crack in an Amador County hillside got quite the surprise. The gap swallowed the sunlight, exhaling sweet, cool air. Translucent pillars flushed orange in the ...

Add Yahoo as a preferred source to see more of our stories on Google. Getty Images Missouri has a whole other world under the surface of the Earth. Far below the surface of Missouri, a state that is ...

SPRINGFIELD, Mo. (KY3) - It’s a unique job that includes several duties. Part doctor. Part engineer. And part Michelangelo. Jonathan Beard goes around painting, planning, and giving new life to cave ...

Explore the stunning underground world of Anderson Spring Cave in this adventure-packed video. Featuring incredible natural formations, tight passages, and breathtaking chambers, this cave is a hidden ...

Explore these hidden underground adventures in Arkansas, where stunning caves and unique experiences await, perfect for ...

BATON ROUGE, La. (AP) — Studies of the area where a sinkhole formed last summer in Assumption Parish indicate scientists suspected as early as 1991 that the Napoleonville Dome was not shaped as state ...