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

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

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

Art and a pun, all in one.

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

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

A slice of central Asia in the middle of Berlin.

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

A Stockholm metro station is home to an escalator that is not only the longest in Sweden, but among the longest in the world.

A 12th-century church with a medieval fresco and an intriguing “Greek runestone.”

A former suicide bridge is now accumulating symbols of love instead of a body count.

A man has revenged his true love's betrayal through tears and stone genitalia.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

Stockholm's deepest subway station is also a stunning ecological wonder.

This Stockholm light tower can be controlled by anyone with a smartphone.

The library's graceful rotunda is like a bibliophile's temple.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Digger attempting to hide itself under 300 tons of rubble.

A symbol for the opposition to nuclear power around the world.

Tiring of digging out the door to this church for every service, it was eventually abandoned to the sands.

Denmark’s never-ending bridge.