Invisible bridge parts the waters, invoking biblical images and preserving the ominous feel of an ancient moat.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

The world's only museum devoted to the wonders of fluorescence.

It's always summer at the beach inside this former airship hangar.

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

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.

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

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

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

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

An eerie, derelict amusement park in Berlin.