Geology

These giant volcanic rocks towering above the Angolan savannah once served as a natural fortification.

Visit Taiwan’s badlands, which allows visitors to feel like they’re walking on the moon.

This coastal rock formation resembles a churning cauldron at high tide.

A remote Arctic mountain range is home to "granite cities" found almost nowhere else.

A striking geological formation in Southern California.

These four small islands contain unique hexagonal rock formations.

An enormous boulder deposited by the Scabland floods lies in the Quincy Basin among a host of smaller boulders.

An attractive free-plunge waterfall outside Bend in the Deschutes National Forest.

An artificial cave littered with semi-precious stones waiting to be picked up.

This 470-meter-long dripstone cave was discovered by chance in 2006.

A narrow fjord-like lake, the third-deepest in the United States, runs for over 50 miles into the Cascades of Washington state.

Jurassic clays where the dinosaurs once roamed.