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

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

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

A subterranean display of public art and architecture.

The only microgravity tower in Europe can produce nine seconds of weightlessness.

A spitting ode to a German serial killer.

One of the oldest wine cellars in Germany is now a restaurant beneath Bremen's town hall.

Eight naturally mummified bodies in glass coffins are housed in an underground crypt.

This naval gun is fired every day at noon, an odd timekeeping tradition the origin of which is local legend.

A butcher shop in Minneapolis has all the meats and cheeses you’d expect from any of its kind—except that all the products are vegan.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

One of the most iconic neon ads of former East Germany.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

It's good luck to be mocked by this monkey.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

A collection of artworks exclusively created by the mentally ill that was almost burned by Nazi culture police.

Survival capsules find a second life as a unique hotel.

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

A former plague hospital turned medical museum.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A floating cat sanctuary on an Amsterdam canal.