A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

An abandoned relic of the city's failed experiment with below ground transit.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.

Beijing's expansive subterranean hiding spot now crumbles away as a tourist destination.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

This abandoned subway station can still be seen on regular commuter trips.

The remains of a failed subway in upstate New York is now an underground graffiti bunker.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

A massive work of modern art that appears to be a crop circle in the middle of the desert.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

The Arctic Circle runs through this isolated spot north of Iceland.

The discovery of this Neolithic settlement, which contained a Stone Age "cathedral," threw archaeologists for a loop.

A popular day's outing in Bovington consists of watching military tank driving practice.

A fairy garden in an old hotel hidden in La Marquesa forest.

Virgil's many-mouthed gateway to the underworld.

Steaming blood-red hot spring from hell.

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

A deadly ancient portal to the underworld.

According to one local tradition, the entrance to the Voodoo underworld can be found in New Orleans through seven gates scattered throughout the city's French Quarter.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

The ancient settlement attracts tourists from all over looking to learn about the Chinese vision of the afterlife.