Beneath the surface of Europe’s most enigmatic mountains lies a hidden world that will take your breath away—then freeze it in an instant. Caves—formations made in soluble limestone, gypsum, and ...

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 ...

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 ...

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 ...

There are hundreds of caves in Belize that served as portals to what the Maya called Xibalba—home to ancient death gods, rituals, and extraordinary relics left behind. Accessible only by kayak or ...