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

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

A series of playful yellow penguins share a serious message about the environment.

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

Before serving as James Bond's Casino Royale, this Victorian-era spa catered to the world's elite.

An unusual heating plant that has garnered notoriety for its distinct shape.

This spherical sculpture has also been dubbed "the steel orange" due to its likeness to a massive, sliced piece of citrus.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

Macabre astrological automaton clock dating to the late 1400s.

Enormous sandstone towers loom within a Czech forest.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

Monasteries on rock pillars, once accessible only by frayed ropes.

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

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

The soulless eyes of 82 bronze children stare on forever in remembrance of a horrifying World War II massacre.

This enormous abstract sculpture is part jungle gym, part elaborate noise-making machine.

The first mosque in the world to receive electricity.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

This ironic war memorial thumbs its nose at a campaign of inedible humanitarian aid food products.

Some of the best-preserved specimens of the monumental medieval tombstones found throughout Bosnia and Herzegovina.

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.