A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

This massive steel pyramid can be entered by a set of jagged steps that let visitors stand in its heart.

A surreal museum of extraordinary industrial objects.

A slice of central Asia in the middle of Berlin.

Started as a kitchen garden, now the second largest botanical garden in the world.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This giant tower beacon was a key navigation tool for pilots delivering mail amid the night skies.

This oddity shop contains everything from antique tools to a human skeleton.

After this former brothel closed, its interior remained almost frozen in time.

It was once used as a classroom to teach mining skills to local high school students.

Three generations of intrepid collectors display their curious artifacts in a homemade museum right next to the caves they discovered.

Home to a timed geyser created by complete accident.

Birdhouses, peacocks, animal sculptures, and a graveyard are all found along this eclectic nature trail.

These century-old beehive-shaped kilns were built to produce charcoal for nearby mines.

A museum dedicated to the history and art of staying clean.

An Idaho legend carved out a cave village with his own two hands.

When in Idaho, sleep in a giant potato.

Natural rock water slides hidden in the remote forests of northern Idaho.

The largest outdoor art gallery in the Northwest United States.

Denmark’s never-ending bridge.

Home to the deepest rift anywhere on Earth.

For six months of the year, three giant mirrors direct a pool of sunshine onto this otherwise occluded town.

Countless grotesque faces stare out from this eerie Prague art wall.

A toxic ghost town sitting atop a massive coal fire.