Retirement home for giant obsolete machines.

This former steel and coal plant is now a neon-lit industrial fantasia.

The "Prussian Versailles" that is as glorious today as when it was built.

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

Berlin's old airport.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Super-heavy Nazi architectural experiment.

No need to strap in for a "ride" on this walkable roller coaster.

A museum dedicated to a Cold War era sausage.

This "floating railway" is one of the world's oldest monorail systems.

A fascinating insight into daily life in the Eastern Bloc.

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

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

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

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

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

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

This abandoned fighter jet launch center is now a haunting street racing course.

The Guardian of Tallinn.

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.

Cat art as far as the eye can see.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.