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

A surreal museum of extraordinary industrial objects.

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

The world's most delightful not-NOT-religion welcomes visitors to the town of Templin, just like its more stoic peers.

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

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

An eerie, derelict amusement park in Berlin.

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

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

The largest open-air contemporary art center in Latin America is a unique experience in the Atlantic Forest.

A mocking tribute to the past and modern leadership of Prague.

A bus with a butt and biceps to put Olympic athletes to shame.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

Peeing dogs guard the Roman hunting goddess atop a fountain at France’s Château de Fontainebleau.

When you've got to go, you've got to go.

Brussels' favorite peeing boy has a sister.

Meet the bronze beloved pet to a family of famous peeing statues.

A meow-velous tribute to a beloved street cat, made famous on the internet.

This artificial cave looks like something out of a fairytale.

The first museum in the world devoted to sexual gadgetry.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Every summer local children form "pysja patrols" to save young birds that have wandered from their nests.

This monument to one of the largest science fiction games of all time bears the names of hundreds of thousands of players.