A floating cat sanctuary on an Amsterdam canal.

The world's only museum devoted to the wonders of fluorescence.

An abandoned underground bathroom is now a space for public art.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

This peculiar museum offers hands-on interaction with seemingly intangible principles of mathematics.

The narrowest street in the world is in danger of closing up entirely.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

Crop circles inspired this whimsical garden in Germany.

The many—66 to be exact—faces of the German forest.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

A tiny island is connected to the mainland by a private railway that residents travel in their own personal wagons.

Each year, Germany's "City of Dragons" slays the world's largest walking robot.

At this unusual park, domes, ladders, chairs, and more are made from trees.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Go surfing on this urban wave, "hacked" by local surfers.

Horrifically creative torture devices and shame punishments line the walls of this chilling museum.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

Just a few miles from downtown Atlanta is a trail covered in a crazy collection of outsider art.

Puppet theater and museum holding a collection of more than 300.

This former steel and coal plant is now a neon-lit industrial fantasia.

This 600-year-old home seems to defy physics.

A quaint Russian village in the middle of a German metropolis.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.