Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

A haunting collection of the vanished and disappearing natural world.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.

Colloquially known as “piss alley,” this narrow street filled with tiny bars and barbecue stands looks like it was pulled straight out of “Blade Runner.”

Japanese company creates clone dolls that reside in the "uncanny valley."

If Hello Kitty were Mickey Mouse, this would be Disneyland.

This giant crucifix is like U2's Joshua Tree for Swedish death metal fans.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

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

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."

Striking occult iconography on a medieval German church.

This German museum is devoted to all aspects of grave culture from headstones to coffins.

Named after a militant urban guerilla, this famous former squat is a graffiti-covered stronghold of leftist culture.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

This German bone house contains the remains of some 20,000 souls.

Berlin's old airport.

These blingy, baubled skeletons lie in glass boxes inside a baroque Bavarian church.