The 14th-century ruins are said to contain healing powers.

A former squatter's paradise outside Prague.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.

A crucified and bearded female saint.

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

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

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

The largest of Denmark's seven mysterious round churches stands on an island in the Baltic Sea.

An old asylum graveyard that's been abandoned for half a century attracts those seeking a dark thrill.

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.

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

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

This ultra-modern wooden boardwalk turns the ocean into a swimming pool.

A natural wonder in south Denmark.

This sublime architectural marvel is a rare example of an expressionist church.

A field filled with carved medieval tombstones called stećak.

Celebrated example of Ottoman architecture that also served as a site for brutal massacres.

An abandoned brutalist monument whose history has been lost to the ages.

This abandoned airplane hanger is said to have once been a top secret launch facility.

This abandoned Olympic skiing facility still bears the scars of the Siege of Sarajevo.

A forgotten and crumbling Yugoslav monument to the victims of fascism.

This surreal memorial/cemetery is a necropolis of crumbling stonework and puzzle-shaped headstones.