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

This cubist Vienna church building looks like some sort of alien stonehenge.

A peculiar samurai statue overlooks the center of Brno.

A cheeky architectural easter egg.

A moving and macabre World War I-era painting by the great artist Otto Dix.

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

The largest bottled beer collection in the world holds over 22,000 unique beer bottles.

Artfully arranged bones of 5,800 Austrians.

An eerie, derelict amusement park in Berlin.

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The largest manmade caves in Europe now function as a motorbike club's headquarters.

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

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

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

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