High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Paris' linguistic guide to the international language of, yes, love.

Notorious artist squat renovated into legal studios.

A tiny, hidden alleyway dedicated to the father of meteorology.

This Manchester laundromat is hiding something.

This Gothic Revival castle used as a shooting location for "The Secret Garden" and other films.

A student driver's nightmare.

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

The final resting place of many of Germany's most famous communists.

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

Art and a pun, all in one.

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

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

A museum dedicated to a Cold War era sausage.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

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

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A fascinating insight into daily life in the Eastern Bloc.

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

Hidden in a Scotland museum is a copse of extinct tree stumps.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The mystery of this small, brick pond eluded its possibly only investigator until his death.