The secret cells in the basement of the KGB's Estonian "Grey House" have been preserved as a grim Cold War museum.

Wars fought and wars won are remembered by these abandoned bunker ruins.

Relics from an era long gone, sit idle outside this Estonian museum.

Rusted cars, trucks, and buses form a fascinating collection of Soviet-era machinery.

This Soviet-era "closed town" was a top secret uranium producer often left off of maps.

Spend your honeymoon where the Devil had his wedding.

The gutted remains of this Estonian mansion are a monument to a tragic love.

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

Mysterious craters may have been home to an ancient cult.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

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

Visitors can explore the role of mysticism throughout the ages inside this interactive museum of magic.

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

A fascinating insight into daily life in the Eastern Bloc.

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

A wunderkammer of mysterious objects and stories.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

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

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

A surreal museum of extraordinary industrial objects.

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

A slice of central Asia in the middle of Berlin.

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

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