This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

A waterfall runs right through the middle of this Taiwanese shrine to the hundreds of workers killed while building a nearby highway.

Bolivia's needle-like rock formations.

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

Secret North Korean passage discovered below the world's most dangerous border.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

The world's most remote airport.

The rusty hull of this 1899 ship serves as a tribute to explorers of the bottom of the world.

A deserted 20-lane highway runs through Myanmar's empty capital city.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Catacombs turned marketplace.

A hands-off space for graffiti artists to hone and display their skills.

London's smallest police station is barely the size of a phone booth.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

Hundreds of caves once used to store grains and animal feed.

The historic tower houses of this nearly abandoned Greek town have been compared to the spikes on an iguana's back.

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

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

Real bones which are said to have belonged to a Polish dragon.

Monasteries on rock pillars, once accessible only by frayed ropes.