A museum of magic with a Sadist past.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

A haunting collection of the vanished and disappearing natural world.

Paris' linguistic guide to the international language of, yes, love.

A museum of carnival attractions where you are invited to ride the rides.

Abandoned railway line circling the city of Paris.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The ruined remains of the airport Claus von Stauffenberg departed in his failed attempt to kill Adolf Hitler.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

It's always summer at the beach inside this former airship hangar.

No need to strap in for a "ride" on this walkable roller coaster.

A wunderkammer of mysterious objects and stories.

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

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

Ruins of a German Castle on top of a towering stone pillar.

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

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

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

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

An eerie, derelict amusement park in Berlin.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A colorful street named for the legendary Australian rock band.

One of the oldest theaters in Australia, it's also said to be haunted by a performer who died on stage.

Over two million dolls have been healed during this hospital's century in business.