Puppet theater and museum holding a collection of more than 300.

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 monument to the man who almost killed Hitler.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

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

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

Floating swimming pool within a moored vessel.

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

A 12th-century fortress containing some of Berlin's oldest buildings.

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

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

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

Super-heavy Nazi architectural experiment.

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

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

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 fascinating insight into daily life in the Eastern Bloc.

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

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

A collection of abandoned typographic signs from Berlin and beyond.

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