Just three years ago, a group of Idaho men traveled to an unnamed Western state and in an unnamed range of rugged mountains, hiked up a steep trail. At the top, they unraveled climbing ropes, stepped ...

The most common process by which limestone caves form involves carbonic acid — or weakly acidic groundwater — as the primary agent. When carbonic acid contacts limestone, it dissolves minerals in the ...

The Big Room at Carlsbad Caverns with its gypsum formations and its huge space--bigger than six football fields and as tall as a 30-story building--inspires awe for 500,000 annual visitors, but it’s ...

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 ...

There's some complex chemistry behind a cave's stalactites and stalagmites. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Stalactites and ...

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 pink, blue and green.

Mars skylights like this could be the mouths of caves formed by lava tubes. NASA wants to explore them. Credit: NASA / JPL-Caltech / Univ. of Arizona Ever since scientists have had an orbiter's view ...

Student Jacqueline Heggen showing off glowing formations within Wind Cave. (Joshua Sebree via SWNS) By Stephen Beech Fluorescent caves deep below America show how alien life could exist on one of ...

Mexico's Yucatán Peninsula hides Sistema Ox Bel Ha, the world's longest explored underwater cave system, stretching over 524 km. Formed by dissolving limestone, this vast network, rich in freshwater, ...

If human beings want to survive on the other planets for a long time, they must first find or set up a safe, stable, and long-term shelter. Lunar lava tubes are geological structures of the moon ...