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

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

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.

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

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

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

Op-art architecture designed for happiness.

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

On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

A relic of World War I that now exist as a piece of public art.

Once the home of a hermetic monk, this cave now houses a small church.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

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

The metal leaves on this tree are engraved with the names of Holocaust victims.

A plaque bearing the names of those who dedicated themselves to protecting Budapest's Jewish population during World War II.

This sculpture honors the man who was known as the "Righteous Among the Nations."

This building has survived for more than a century and remains virtually untouched.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A stone woman in a stylized dress honors a courageous politician.

A much-loved sculpture depicting the hero of a 1956 anti-Soviet uprising.