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 ...

Imagine walking into Petra, Jordan without the hustle and bustle of tourists clamoring over each other for photos and mule ...