An additional 167 miles were just explored at Wind Cave, making it the sixth-largest cave system in the world, right behind Jewel Cave in the Black Hills. “One of our explorers, she found an ...

Caves Regional Park is located in the Škocjan Karst, a vast flat landscape that lies at an elevation between 420 and 450 m in ...

But there’s only one that’s home to the world’s longest cave. That 400-mile wonder can be found under the rolling Southern hills of Kentucky. So, explorers, pack those walking boots.

Nestled in the rolling mountains of Northern Virginia, Luray Caverns is known as the largest cave system in the eastern ...

Connecting the two would create a “super system,” one of the longest ... and for a decade afterward it stood as the world’s largest known cave passage. In 1991 a cave discovered in Vietnam ...

Take an otherworldly journey through Hang Son Doong, the world's largest cave located in Vietnam. The cave is more than 500 feet tall, 650 feet wide, and 29,500 feet long. Video courtesy of Ryan ...

two of the top three largest known caves in the world. To get there, a punishing path and 90 percent humidity test even the fittest hiker. A walk for the fortunate few: Only a limited number of ...

Discovered in 1999 inside an abandoned mine in Southern Spain, Pulpí Geode is the largest crystal 'cave' of its kind in the world. But what exactly is a geode and how do crystals form inside them?

For just a few weeks a year, sunbeams shine two hundred metres down through a hole in the cave roof, illumining the underground world. Filming this natural lightshow successfully relied on it ...

The Camuy River flows through the third largest cave system in the world — so extensive, in fact, that it underlies parts of three towns: Camuy, Hatillo, and Lares. Accessible via the main ...