This lucky bronze frog was gifted to Madrid by a casino.

The earliest known map to show America, discovered by accident at a Paris bookshop.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

This amazing abuela became a diehard metal fan late in life and an icon of Madrid's '80s rock scene.

A lush indoor jungle fills this bustling Madrid transportation hub.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

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

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

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

A bus with a butt and biceps to put Olympic athletes to shame.

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

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

This former quarry is now a picturesque gorge that hides a sunken lake.

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

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

Microscopic scenes; some call it novelty, some call it art.

An Orwellian sculpture with eyeball cameras watches passersby.

This automated sculpture of two men peeing will spell out text messages with their micturition.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

The first museum in the world devoted to sexual gadgetry.

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

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

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

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