Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

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

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

Started as a kitchen garden, now the second largest botanical garden in the world.

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

Super-heavy Nazi architectural experiment.

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

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

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

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

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

A surreal museum of extraordinary industrial objects.

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

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

A collection of abandoned typographic signs from Berlin and beyond.

A museum dedicated to a Cold War era sausage.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The traditional Polish croissant, folded 81 times into the shape of a horseshoe, is a legally protected cultural treat.

A quaint Russian village in the middle of a German metropolis.

This micronation's flag honors its favorite drink, Kaffegöken, or "cuckoo-coffee."

Dedicated to the unsung history of human waste.

The world's first interactive human body museum also serves as a chair for a giant orange man.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

Where manatees are the snowbird vacationers in these balmy Florida springs.