A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

A purr-fectly spirited bronze celebration of local street felines through history.

Blending modern art with Baroque architecture, this wondrous mosaic grotto serves as the late artist's final creation.

This Volcano-like rest area was designed by architect Giulio Ceppi built according to energy efficiency and ecological footprint standards.

Dedicated to the man who saved hundreds of children from Nazi-occupied Czechoslovakia.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

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

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

Macabre astrological automaton clock dating to the late 1400s.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

The medieval "Bearded Man" relief still serves as a clever flood warning marker.

A surreal statue honoring Prague's favorite literary son.

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

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

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

Banished from town, this local jester concocted a clever return.

This statue of a studious young woman stands at the site of Leuven's first college to accept female students.

A giant bug impaled on a 75-foot-tall needle.

Intricate metal sculpture that's half gothic cathedral, half construction equipment.

A piece of the front end of a British cruiser that was used as a block ship in World War I.

The former home of a trailblazing surrealist is still filled with haunting dolls and grim paintings.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.