Explorers in southern Spain have linked two deep caves into one “supercave system” about 16.4 miles long. The connection sits ...

Deep inside a sealed 40-mile cave system, the team films everything — from blinding white crystal ceilings to ancient jaguar ...

Using only bare hands and natural materials, an underground cave house was built with a private living room carved deep into ...

Climate history recorded in a calcite deposit in a southern Nevada cave indicates that the hot, arid southwestern United ...

Bowling Green hides Kentucky’s only underground boat ride, a serene glide along a subterranean river that flows through cathedral-like chambers. Lost River Cave blends easy access with genuine ...

A ridiculous but instructive thought experiment involving deep time, plate tectonics, erosion and the slow death of the sun ...

Had one hoped to leave a time capsule for today’s Bostonians in the Permian period 250 million years ago, much less the Pliocene epoch four million years ago , they would have been completely, utterly ...

Scientists find the DNA of a 300,000-year-old horse in Schöningen, driven to extinction by hunting, next to a wooden spear ...

The United States is home to several rare animal species that exist nowhere else in the world. Many of them live in protected ...

A total of 25 preserved canid prints were discovered in various chambers of the Grotta della Bàsura in northwest Italy. In ...

Hike Windlass Cave in Tennessee—a tight, rocky, cliff-lined trail that leads to a narrow cave tucked into the Cumberland ...

When Tom Sawyer Island closes at the Magic Kingdom this weekend, Disney World's going to lose most of its cool fake caves.