This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

You've probably seen these distinctive orange-tiled columns on the big screen.

This monumental work of art symbolizes the coming together of a previously divided city.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

Metro station with a claim to rock n' roll fame.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

One of the world's heaviest musical instruments towers within a popular urban park.

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

These brass bunnies honor the rabbits that dominated the no-man's-land around the Berlin Wall.

Art and a pun, all in one.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Red, white, and blue painted steps along with a Union Jack celebrate the outcome of Gibraltar's 1967 referendum.

Single runway interrupted by a busy road that cuts across its middle.

The world's largest wooden structure.

The final resting place of the great navigator, or maybe his brother.

A historic and beautiful Art Nouveau chamber in a historic railway station.

A Baroque mansion with ties to legendary magicians and alchemists.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

Monument to a suicide protesting the Soviet invasion.

Looming communist pillar with a Czech twist.

This spooky statue sits outside a famous Prague theater.

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