Looming communist pillar with a Czech twist.

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.

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

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

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

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

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

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

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.

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

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

Macabre astrological automaton clock dating to the late 1400s.

A church of bones, decorated with 40,000 human skeletons.

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

This strange statue features a bust of the famous composer plopped atop a woman's body.

This museum promotes informed contraception by documenting its often secret past.

Archduke Ferdinand II's collection of rare objects is considered one of the oldest museums in the world.

A patriotic medieval knight in driven-nail armor raised money for widows and orphans of WWI.

This 19th century cyclorama acts like an analogue time machine to a different era.

A three-shelf library serves as a memorial in the Jewish cemetery of Krems.

Part ski resort, part modern art space, this lodge brings giant metal spiders and bloody doors to the Austrian Alps.