The stalactites and stalagmites of Sequoia National Park’s Crystal Cave, a sprawling subterranean wonder that’s been closed ...

Rattlesnake Saloon is sheltered by a massive rock overhang. Lawrence Specker | [email protected] ...

We were hiking across a mountain ridge when we came across what looked like just another hole in the ground - but it turned ...

Cadomin Cave is Alberta’s largest known bat hibernaculum. The cave, among the largest in the Canadian Rockies, is a critical ...

Many of these waterfalls can be found deep in state parks, along rough hiking trails, or down in steep sinkholes.

Michalis Giannakos left Amorgos after high school 20 years ago, but remembers visiting the monastery as a child and seeing ...

And just to throw this into the mix: the half-mile trail to the cave entrance is steep and strenuous. It’s described as the equivalent of climbing the stairs of a 20-story building. You must be ...

Located in scenic Sequoia National Park, this sprawling marble cavern will once again welcome visitors after a four-year closure.

Crystal Cave includes more than 3 miles of surveyed passageways, carved by water over roughly a million years. Its temperature is a steady 50 degrees. Its walls are marble — not the granite that ...

The ultimate rock star entrance: a Norfolk Southern train emerges from the limestone cathedral, stealing the geological spotlight. Photo credit: Natural Tunnel State Park Carved through a ... modern ...

Named after a 60-foot natural limestone bridge that stretches over its entrance, Natural Bridge Caverns is the largest commercial cave in Texas ... and passageways carved over thousands of ...