Terrifying derelict military hospital once housed a recuperating Hitler.

The only residents of this abandoned housing development full of identical castles are stray cats and dogs.

A New York–based physician returned home to Spain to build his own elaborate monument to Christopher Columbus.

Pilgrimage site for star-crossed lovers.

This home is decked out like a psychedelic explosion of colors and bowling balls.

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

This bar and museum are devoted to the controversial comic book work of Kája Saudek.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This small condiment museum makes all manner of mustards with a 200-year-old mill.

A university observatory dome painted to resemble the beloved 'Star Wars' droid.

This unique exhibit "Dialogue in the Dark" reverses roles as the visionless become guides and the sighted become ‘blind.’

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

This 8th-century Bavarian monastery is home to an exquisite Baroque-era library.

This 600-year-old home seems to defy physics.

When the rain falls, this drain system turns into a musical instrument.

This "floating railway" is one of the world's oldest monorail systems.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

An eerie, derelict amusement park in Berlin.

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