Geology

This canyon is named for a unique geologic formation where the river vanishes underground near the mouth of the canyon and reappears farther down.

The now-serene site of the largest earthquake ever recorded in North America.

A geothermal paradise with bubbling mud pools and bright blue hot springs.

See 150 million-year-old dinosaur tracks and bones dating back to the Jurassic period.

Once one of the most polluted caves in America, now an environmental success story and a museum dedicated to caves.

Red rock "fangs" jut out of the desert near the Extraterrestrial Highway.

The walls of the statehouse tell the story of Ohio’s prehistoric past.

This mesmerizing and surreal landscape features intricate patterns of white and red sandstone.

This hidden gem in Arizona is truly worth the rugged journey.

The only United States mine for magnesium carbonate has been operating continuously since the 1930s.

A wonderland of caves in eastern Iowa.

A series of magical limestone formations along the coastline of the country island of Antigua.

A large, remote national monument highlights the typical geologic structure seen in Nevada.

In the heart of Luxembourg's "little Switzerland" weaves a breathtaking natural sandstone canyon with a mythological past.