Inside the Šomoška National Nature Reserve exists a unique rock formation rarely seen in the world.

The massive white mound and accompanying water terraces are a striking geological oddity.

Tucked away in a Prague park, a statue beloved by romantics honors a poet so nice they buried him twice.

A series of playful yellow penguins share a serious message about the environment.

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

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

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

Macabre astrological automaton clock dating to the late 1400s.

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

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

This grubby wall is said to be one of the Earth's esoteric energy centers.

Stockholm's narrowest alley is barely over two feet wide.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

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

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

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

What looks like a suicide in progress is actually a statue of Sigmund Freud.

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

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

This impressive Boston holy house is the American mecca for Christian scientists.