An abandoned swimming pool decays on the outskirts of Berlin.

A monument to the man who almost killed Hitler.

A traditional U-Bahn station in Berlin gets a string of rather untraditional benches.

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.

When German-Iraqi relations broke down, this embassy was vacated post haste.

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

This conical hill was built as a testing ground for an engineer known as the Glider King.

This little museum is making sure that the art and history of the graffiti sticker is not scraped from history.

Berlin's old airport.

Floating swimming pool within a moored vessel.

Blitzkrieg bop your way through Berlin's Ramones Museum.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

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

Super-heavy Nazi architectural experiment.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

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

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

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

A fascinating insight into daily life in the Eastern Bloc.

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

A wunderkammer of mysterious objects and stories.

A collection of abandoned typographic signs from Berlin and beyond.