This 317-ton walkable art installation is an homage to Korea's "City of Steel."

This magical grotto is adorned with a complex pattern of native seashells, minerals, and fragments of colored glass.

This massive underground salt mine now holds a sci-fi theme park in its depths.

The translucent turquoise hue of these natural swimming pools comes from a high concentration of minerals.

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

There is a small island in the Gulf of Nicoya where the only human inhabitants are dead.

In Costa Rica's cloud forest, the roots of a woody ficus create a botanical bridge.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

Once the foundation for a mansion, these ruins now offer amazing panoramic coastal views.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Stuck in a bygone era, the oldest subterranean shopping street in Japan hides beneath the popular Asakusa district of Tokyo.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Eyam took steps to quarantine themselves and keep the plague from spreading.

An unprepossessing stone marks the last resting place of one of the most accomplished Native Americans in history.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

Mummified monks and the accidentally interred, in a 17th-century crypt.

Europe's second largest ossuary wasn't discovered until 2001.

The remains of 40,000 humans, meticulously stacked in a tiny churchyard shed.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

The kitsch mansion of the former Romanian president Nicolae Ceaușescu features a golden bathroom.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

A fantastic assortment of China's finest and most disturbing wares.

A water pumping station disguised as a residential home to assuage concerned neighbors now tricks most passersby.