A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

A huge musical instrument played by the ocean.

The remains of a ruined mansion memorialize the 1906 earthquake.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Art in the form of a winding, man made crack in stone.

The "dragon babies" of southeastern Europe.

This one-time health resort was used by aristocrats around the world.

This abandoned Slovenian military barracks has become a punky-political art squat.

Colorful power station with a chimney equipped with a gallery for exhaust monitoring equipment.

A whimsical bridge adorned with decorative dragons.

A cemetery for Slovenian notables also serves as a popular recreation space.

The world's largest model of our planetary system.

Early habitat dioramas and home of the elusive gaff, the skvader.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

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

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.