We ventured into the depths of Ellison’s Cave in Georgia, home to the deepest freefall pit in the contiguous United States - Fantastic Pit, plunging 586 feet straight down. In this video, we document ...

Cavers from the Southern Tasmanian Caverneers, a speleological organization based in Hobart, Australia, made it through the 1,316-foot-deep (401 meters) cave in Tasmania, an island south of ...

The glacier’s ice caves aren’t safe to explore alone, but there are plenty of guided tours available to book online. CURIOUS is a digital magazine from IFLScience.

Beneath the Earth’s surface lies a world so extreme and isolated that it seems more like an alien planet than part of our own ...

In Scărişoara Cave in Romania’s Apuseni Mountains, Persoiu has been climbing down a 150-foot-deep shaft to reach a perennial ice block with a surface the size of seven basketball courts.

At 26 miles deep, Austria‘s Eisriesenwelt is the world’s largest ice cave. But only the first half mile of the formation is open to visitors. Photograph by Robbie Shone, National Geographic ...

The deepest hot springs in the world feeds this Colorado wintertime playground Pagosa Springs also offers ice caves, dog sledding, a river walk and more ...

The Erebus Glacier is an ice tongue that's around 11 to 12 kilometers (around 36,000 to 39,000 feet) long and flows down from Mount Erebus, Antarctica's second-highest volcano.

From the Decorah Ice Cave to Maquoketa Caves State Park there are more than 1,000 caves in Iowa. Here's a guide to seven of the most popular, all in one area of the state.

The Castner Glacier ice cave off the Richardson Highway near Black Rapids attracts some 8,000 people annually. But federal officials and a University of Alaska professor are advising hikers to be ...

Snezhnaya Cave (Georgia) Staying in Georgia, Snezhnaya Cave ranks fourth, stretching down to 5,774 feet (1,760 metres). This extensive cave system is known for its underground rivers and ice ...