While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.

A century-old prison in the heart of Vilnius is now a lively bar, dance club, and artist residency.

This micro-nation may be some sort of prank, but its constitution sure seems official.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

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.

Berlin's old airport.

Tiny memorials honor individual victims of the Holocaust.

A monument to the man who almost killed Hitler.

One of downtown Berlin's last reminders of its Communist past.

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

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

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

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

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

The most visited, and possibly most controversial, museum in Germany.

A surreal museum of extraordinary industrial objects.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

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