This unusually shaped mountaintop tower looks like a UFO floating over the city.

A former squatter's paradise outside Prague.

Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.

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

Mummified monks and the accidentally interred, in a 17th-century crypt.

Bohemian paradise covered in majestic forests.

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

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

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

Two monstrous faces loom over a village in Czechia.

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

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

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

This artificial cave looks like something out of a fairytale.

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

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

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

Walk through Czech history in Prague's largest graveyard.

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

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

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

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