This bronze statue of Martin Luther King was placed in the park without permission.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

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

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

This massive statue is the personification of Bavaria and the first colossal statue of the modern period composed of bronze.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

A moving memorial to the fallen and missing from WWI trenches.

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

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

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

An eerie, existential museum dedicated to the author of "The Metamorphosis."

Macabre astrological automaton clock dating to the late 1400s.

Everyone from Alan Ginsberg to The Rolling Stones has stopped by this classic dive bar.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Baroque celebration of the end of the Great Plague of Vienna.

Op-art architecture designed for happiness.

Dine amidst exotic plants at this former royal greenhouse.