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.

A restaurant and observation deck built in a unique broadcasting antenna.

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

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

Visitors can explore the role of mysticism throughout the ages inside this interactive museum of magic.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Where once there was a train station bathroom, there is now this German burger joint.

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

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A brush maker used his factory to protect blind Jews from the Gestapo.

A wunderkammer of mysterious objects and stories.

This boat represents the promise of undiscovered territory, a dream of hope, and progress and freedom for Iceland.

The remains of a hospital that housed over 200 leprosy patients.

A monument dedicated to the civil uprisings that took place during the Pots and Pans Revolution.

Iceland's tribute to its thankless civil servants.

This oceanside Reykjavik spot is speckled with recycled sculptures and large stones.

An encyclopedic collection of mammal penises.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This lonely tomb is all that remains of a once-bustling ancient trade hub visited by Marco Polo.

Traditional architecture and ancient irrigation systems are on display in this gorgeous mountain village.