Visitors seeking unique and quirky attractions should explore America's largest man-made crystal cave, located in the city's ...

Hang Son Doong, located in Vietnam’s Phong Nha-Ke Bang National Park, is the world’s largest known cave, with vast passages ...

We’re about to dive into the deepest caves, scale the tallest peaks, and try to keep our footing against the blusteriest ...

Known as Cueva de los Cristales (Cave of Crystals), this hidden chamber in Mexico holds some of the largest natural crystals ...

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 ...

At dusk, a swarm of bats disperses to hunt in the rainforest surrounding Deer Cave. One of the planet’s largest underground passages, it holds more than two million bats. This story appears in ...

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 ...

In a cave there’s no way to get a signal. There’s no way to talk with anybody except the people around you. A cave explorer stands atop a large spiral stalagmite in the Watch Out for Dinosaurs ...

Hang Son Doong, the world's largest cave in Vietnam, was discovered in 1990 and is a breathtaking natural wonder. Formed over millions of years, this massive cave features towering stalagmites ...

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?