Whether it's 100 degrees or below-freezing, these caverns in the Sierra Nevada foothills stay at a constant temperature for ...

When delicate cave formations are damaged, Carlsbad Caverns National Park calls on the fix-it skills of Michael Mansur and his growing legion of volunteers. Nothing good happens fast in a cave. Those ...

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 ...

Discover the 25 strangest geological formations on Earth, from pink lakes to stone forests. Explore bizarre natural wonders ...

If you’ve ever been on a cave tour where the guide shines a black light, you’ve seen the walls and formations glow. The stunning fluorescence is often the result of impurities trapped in calcite rocks ...

SAN DIEGO, March 25, 2025 — Deep below Earth’s surface, rock and mineral formations lay hidden with a secret brilliance. Under a black light, the chemicals fossilized within shine in brilliant hues of ...

Cave explorers have traversed what’s now the deepest known cave in Australia. On Saturday a group of explorers discovered a 401-metre-deep cave, which they named Delta Variant, in Tasmania’s ...

Scientists have discovered Thang Cave in Vietnam's Phong Nha-Ke Bang National Park, home to rare cave pearls and pristine ...

The largest Croatian cave system was discovered entirely by chance, and it revealed fascinating evidence of a 20,000 year old ...