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.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

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

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

Legend says this sacred tree was a gift from goddess Athena.

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

Where commuters walk through remnants of an ancient Greek necropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.

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

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

The first mosque in the world to receive electricity.

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.

Oriental bazaar in the heart of Sarajevo.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

A two-way chairlift system between Zugliget and the highest point in the city.

An architectural oddity hides in plain sight on this iconic London bridge.

Humble beginnings for one of the world's most famous scientists.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

This 11th century tower is said to be the oldest building in Oxford.