After the parade, students throw their beads on the tree hoping for good luck on exams.

It's clear this abandoned Art Deco gem was no ordinary cleaners.

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

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

A collection of incredible clay crafts, complete with earthen skeletons and mermaids.

These brass bunnies honor the rabbits that dominated the no-man's-land around the Berlin Wall.

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

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

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

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

Berlin's old airport.

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

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

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

A collection of abandoned typographic signs from Berlin and beyond.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

A slice of central Asia in the middle of Berlin.

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

An old department store turned Nazi prison turned artist commune.