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

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

The remains of Alfred Nobel's first nitroglycerine factory can still be found on the shores of a Swedish bay.

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

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.

Where once there was a train station bathroom, there is now this German burger joint.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Azerbaijani ghost town, decaying after a war left it an armed forces buffer zone.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

Less a museum than a bizarre fantasy world created by artists and engineers.

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

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

An eerie, derelict amusement park in Berlin.

A century-old shot ball factory tower is open to the public once a year.

The longest hedge maze in the world.

Floating swimming pool within a moored vessel.

A psychedelic labyrinth on the San Francisco bay.

Fall down the rabbit hole into a surreal journey of human consciousness "from ass to soul."

This little museum is making sure that the art and history of the graffiti sticker is not scraped from history.

Super-heavy Nazi architectural experiment.

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

Art and a pun, all in one.