A spiral staircase twists to the top of this unusual Czech lookout tower.

This former quarry is now a picturesque gorge that hides a sunken lake.

A saintly relic hidden in a Prague church basement.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

This doorless 20th-century elevator doesn't stop or slow down.

Bohemian paradise covered in majestic forests.

This automated sculpture of two men peeing will spell out text messages with their micturition.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

This artificial cave looks like something out of a fairytale.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

A mocking tribute to the past and modern leadership of Prague.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

Two monstrous faces loom over a village in Czechia.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

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

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

Europe's second largest ossuary wasn't discovered until 2001.

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

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.