Spectacular rock formations and fascinating plays of light and shadow: with their thousand-year-old stalactites and underground lakes, the caves on Mallorca's east coast form an extraordinary mineral ...

Most Route 66 motels just offer a bed and a shower. Grand Canyon Caverns Inn threw in a limestone cave system, the deepest ...

From intricate cave formations to the deep sense of history hidden within their walls, these underground wonders end up amazing everyone who walks through these caves, tourists and locals alike.

Its walls are marble — not the granite that dominates the Sierra Nevada range — and an underground stream runs alongside much of the cave trail. The last and largest “room” is known as ...

Carlsbad Caverns is home to some of the most spectacular examples of underground geologic features found anywhere in the United States. Located in southeastern New Mexico, the park contains more than ...

The umbrella leaks at places called sinkholes, from which surface water makes its way underground, eroding the limestone into a honeycomb of caverns. Mammoth, the world's longest known cave system ...

Whether you're drawn to geology, adventure, or simply the strange beauty of the underground, these seven caves are unforgettable stops that deserve a place on your U.S. travel map. Tucked beneath ...