The secret wartime bunker built on the platforms of an abandoned Tube station.

A top-secret bunker now turned museum, is an eerie look at what life would have looked like in the event of nuclear war.

It has an American Dream Car exhibit, Europe's largest Formula One collection, and many, many mannequins.

1898 German railroad depot museum with working engines, steam train excursions, and hands-on displays.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

This historic little railroad runs through some of the most beautiful scenery in Germany.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

Enter the cabin of a life-sized Hindenburg replica.

Hamburgers are intensely proud of their tunnel beneath the river.

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

Daily jousts and dancing barrel makers in Munich's mechanical clock.

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

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

Electrical curiosity museum housed in an old transformer station.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.