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

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

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

148 feet long and in the middle of a verdant forest.

A glittering Thai Buddhist temple in suburban Pennsylvania.

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

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

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

Mysterious rocks that ring musically when struck.

World's first "penitentiary," meant to be humane, drove men insane.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

The FBI's urban training course may have the highest fake crime rate in the world.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

The flower-shaped temple in Virginia aims to transcend the boundaries of the world’s religions.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

Oldest unrestored plantation house in America that is open to the public.

Military and first responders can test their skills in a Foggy Bottom mock station down in Georgia.