Geology

An improbable sinkhole in the sediments flanking the Beaver Dam Mountains.

The "Grand Canyon of Southwestern Idaho" makes a spectacular gash across the flat Snake River plain.

Rocky outcrops containing overhangs, caves, fissures, clefts, and alcoves that invite exploration and scrambling.

Off the beaten path along the coastline of Miura, a scenic cliff with an evocative name.

One of the few slot canyons in New Mexico, this area is fantastic for hiking, camping, and stargazing.

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

At certain times in the fall and winter, the sunlight makes this natural sandstone arch glow.

Once an erosional cave, this scenic arch was lifted up above the sea's surface by an earthquake.

An impressive site containing some of the earth’s rarest living fossils.

A mining camp built around an unexpected occurrence of silver.

This dry lake bed was once an emergency landing strip for military and experimental aircraft.

The bones of prehistoric animals and early signs of human habitation have been found inside Malta's "cave of darkness."

A small cave network was discovered under a home in Xagħra, in 1924 when the owner was digging a well.

A spectacular slot canyon at the northern edge of Lake Mead National Recreation Area.

In 1888, a resident of Xagħra, Malta, discovered a small underground chamber filled with stalactites and stalagmites when digging a well.

A hidden paradise in one of Florida’s most unique rivers.

The geomorphology of the Turia Valley could easily be mistaken for Utah or Arizona.