Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

Bohemian paradise covered in majestic forests.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

Two monstrous faces loom over a village in Czechia.

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

The hidden lair of an alchemist rediscovered in a 2002 flood.

Two stunning 17th-century libraries and a cabinet of curiosities.

Macabre astrological automaton clock dating to the late 1400s.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

Ride a dragon train into a world of dwarves.

This series of underground chambers contains Europe's largest subterranean lake that is slowly drained each day.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

A Jenga-style cylindrical tower of books that appears to go on forever.

Olfactory delights in San Francisco's Botanical Gardens.

A museum befitting the city responsible for supplying the majority of the world's LSD.

A winding path built in secret on the edge of the continent.

The only theatre in the world constructed specifically for sound movement.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A huge musical instrument played by the ocean.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A psychedelic labyrinth on the San Francisco bay.

Enormous small-business mecca in the Midwest, serving dozens of artists.