Volcanoes

Hawai'i Volcanoes National Park is home to one of Polynesia’s largest petroglyph fields.

This lava tube cave was once a Cold War fallout shelter.

Hawaii’s largest cemetery rests inside an extinct volcano crater.

The steep slope known as “Ob Hill” overlooks an Antarctic research station.

Halfway up a volcano at the edge of the world’s largest salt flats is a cave with seven mummies.

These four small islands contain unique hexagonal rock formations.

The easternmost point of Hawai'i plays a prominent role in local legends and is home to a lighthouse that survived a lava flow.

This color-changing crater lake in El Salvador is occasionally impenetrable to sunlight.

An unusual double cinder cone with a bent oval crater, in the Lunar Crater Volcanic Field.

This volcanic crater lake is renowned for its perfectly round shape, stunning blue-green waters, and unique geological properties.

Some 46,000 years ago, a volcanic eruption led to a flooding event that carved this short canyon with steep vertical walls.

An outdoor gallery of sculptures chiseled from a unique stone that deemed Arequipa's old town a UNESCO World Heritage Site.

An incredibly salty lake inside the crater of an extinct volcano.

Two geologically young and nearly circular volcanic subsidence craters, each about a half-mile in diameter, abruptly break the nearly featureless Snake River Plain.

See the imprints of ancient trees, burned and preserved by lava.