From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.

One of the most controversial statues in Romania is an emperor with no clothes.

This once-derelict building is now one of the most beautiful bookstores in the world.

Trimmed trees grow alongside the graves like topiary tombstones.

This historical Netherlands fortress still bears the marks of its single siege.

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

For years, the remains of this ancient Roman fortress were hidden under an orchard.

The patron of this extravagant Art Nouveau confection insisted that nothing less than a boat should project from its facade.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

An "evil painter" included pointed symbols in this artwork to poke fun at members of the Danish Parliament.

This Danish art forest places loud works of contemporary art among the pensive silence of nature.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

The foundations of a forgotten fortress, wedged in between two streams.