The unusual patterns in this rock formation result from two distinct modes of weathering.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This quiet park's strange sedimentary spires were named after Kodak's color film.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

These elusive, isolated rodents evolved into a distinct, locally iconic subspecies.

Rippling sand dunes frozen in the Arizona rock.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

Dramatic river bend surrounds a natural red-rocked pedestal.

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

A Wild West jailhouse that slid down the mountainside.

Home to the deepest rift anywhere on Earth.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Atop an active stratovolcano, two lakes separated by a narrow strip of land.

On the Oregon coast there is a natural hole that seems to be draining the sea.

At the edge of the high desert, California's second-largest natural lake is home to a unique subspecies of trout adapted to its alkaline waters.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

A massive hydrovolcanic explosion left a half-mile wide crater in Death Valley.

The rocks in this arid basin leave trails of movement behind them.

Travelers leave tea kettles in a remote part of Death Valley as part of a mysterious, decades-old tradition.

A brothel nestled amongst ghost towns, with an abandoned plane wreck to greet you.

Odd outsider art installations surround a Gold Rush-era ghost town.

A land of debatable treasure.