Ruins of a German Castle on top of a towering stone pillar.

Tiki luxury on Nob Hill.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

This automated sculpture of two men peeing will spell out text messages with their micturition.

Macabre astrological automaton clock dating to the late 1400s.

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

The first museum in the world devoted to sexual gadgetry.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

In one of the smallest countries in the world stands an original Salvador Dalí sculpture.

This giant meditative chakra sits peacefully in the Flathead Valley of western Montana.

A classic carnival ride that was carved to be untouchable.

This public space is speckled with the eerie remnants of a defunct amusement park.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

There aren't too many operational funiculars around, but Pittsburgh has two!

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Found art has transformed this Pittsburgh neighborhood into a psychedelic dream.

A church of bones, decorated with 40,000 human skeletons.