A few dilapidated structures are all that remain of this deserted former silver mining town.

The last physical evidence of the Lewis and Clark trail is one of their autographs etched into this giant rock.

This ancient ruined monastery has been destroyed by fire so many times that it seems like God hates it.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

One of the world's largest Tesla coils.

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

This isolated structure beckons adventurers with sublime views of the Faroe Islands.

Giant marble phalluses on the sacred island of antiquity.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

A sacred mountaintop temple offers a fine cup of tea to visitors who can survive the journey.

Eerie ruins of an abandoned medieval fishing village crumble atop an unforgiving stretch of earth.

A sparkling sandstone cliffside that's worth a visit while it still exists.

The world's most active stratovolcano is almost always erupting.

This cave was hidden for thousands of years, storing the worldly goods of ancient Native Americans.

A "haunted" landmark on the coast of Southern California.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

The most isolated mailbox in America lets desert travelers record their passing.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

The show's fictional Korean medical camp was created in the Santa Monica hills.