A dazzling display of red rocks weathered into spires and hoodoos.

A small oasis not far from downtown Moab.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

The fifth-longest natural arch in the world, and the longest outside China.

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

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

One man has installed bathtubs into the Utah desert floor to harness the powers of a natural hot spring.

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

This geothermal hot spring hides beneath a slowly growing mineral dome.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

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

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

It would take 35 firetrucks to fill this enormous glacial pothole.

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

Mysterious rocks that ring musically when struck.