Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

This proud Teutonic warrior rises out of a German forest heralding a victory and measuring lightning.

Hiding the longest subterranean river known in the world.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

Walk or bike along a narrow strip of Belgium sandwiched by German territory.

Abandoned since 1998, this train station has become an oasis for urban explorers.

The tallest mountain in mainland Netherlands isn't actually very tall.

Incredible labyrinth of man made caves.

Moscow's imposing monument to the Space Age.

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

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.