The name doubles as an appropriate adjective for this small ossuary.

An old asylum graveyard that's been abandoned for half a century attracts those seeking a dark thrill.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

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

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

This derelict superstructure was a very important warning system for the Soviet military.

One of the most poignant ruins of the Chernobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

This attraction was abandoned after the Chernobyl disaster.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

Like something out of a bad acid trip, this Ukraine hallway has been covered in hallucinatory phantasmagoria.

Climb inside an iron crystal magnified 165 billion times its normal size.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

The Devil’s own choice when he needs a drink in Brussels.

A huge old mansion full of thousands of toys, each there to be used and played with.

A giant bug impaled on a 75-foot-tall needle.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

Hiding the longest subterranean river known in the world.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

Sculpture designed by Turkish artist and professor Mehmet Ali Uysal.