The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

A display of magnificent stained glass windows is the first exhibit of its kind.

Odd, decrepit fountain honors Chicago author who had mixed feelings about his hometown.

A monument to the art of slicing people open.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

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

A half-buried vehicle in Prague's is the latest iteration in a long-running piece by Czech artist David Černý.

A sculpture of the iconic East German car on four legs is a tribute to those who traveled to Prague seeking asylum.

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

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

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

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

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

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

Dedicated to the unsung history of human waste.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

The oldest garden in Prague, once part of an medieval orchard.

This former Indiana quarry has been transformed into a park and SCUBA site where divers can explore the drowned mining equipment.

Covered in tens of thousands of coats of paint, this Indiana attraction holds a world record all its own.

The only freestanding table rock formation east of the Mississippi.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

Years of archaeology, just chillin' by the water cooler.