Four-story slides send people whizzing through the math department at this Munich university.

A giant snail sculpture looking longingly at the German traffic museum.

A stairway to heaven, or to nowhere at all.

The taxidermy remains of the first brown bear to enter Germany in 170 years.

An abandoned train station in Munich constructed for the 1972 Olympic games.

A plaque on the side of a building is a small tribute to the woman who invented an iconic Berlin fast food.

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

Floating swimming pool within a moored vessel.

Art and a pun, all in one.

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

Antique frame collection with 2,400 frames.

Berlin's old airport.

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

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

Cold war icon and onetime "hole" in the iron curtain.

A museum dedicated to a Cold War era sausage.

A miniature city, once ruled by the Queen of the Netherlands.