The medieval network of canals hidden underneath the city is opened to explorers each year.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

More than 70 detailed dioramas—including some rather nontraditional ones—fill this charming museum.

It's good luck to be mocked by this monkey.

A serene temple with stunning stained glass hides in downtown Dallas.

The world's first interactive human body museum also serves as a chair for a giant orange man.

You can walk up Thailand’s naturally non-slip waterfall.

The narrowest street in Paris.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

The site of the first battle of World War II.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

An underground city of salt.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

Time stands still at this serene burial ground in the center of Budapest.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.