Tiny memorials honor individual victims of the Holocaust.

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

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

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

Berlin's old airport.

Floating swimming pool within a moored vessel.

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

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

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

A fascinating insight into daily life in the Eastern Bloc.

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

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

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

A slice of central Asia in the middle of Berlin.

A jaw-dropping "megalibrary" that turns book-browsing into a geometric adventure.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

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

Go inside to really appreciate this 500-year-old technological masterpiece.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.