Geology

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.

These rugged, color-stained mountains hold the secrets of the Kazakh desert.

This small canyon is home to a treasure trove of geological oddities.

This U.S. natural reserve is an ancient spiritual place and rock climber’s paradise.

Idaho’s largest, deepest limestone cave is known for its quirky rock formations and bat population.