This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

Yugoslavia's biggest underground airport lies in ruins.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Twin Peaks' real life Double R Diner has been restored to its damn fine television look.

A spherical "micro-nation" in the heart of Vienna.

Op-art architecture designed for happiness.

The beautiful baroque library of the Hapsburg empire.

Baroque celebration of the end of the Great Plague of Vienna.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

Legends surround an ancient tree trunk riddled with nails for good luck.

Apartment complexes built into huge repurposed natural gas tanks.

An outdoor sculpture park of giant pink robots and post-apocalyptic Christmas scenes.

A playground built by the kids that is a child's wonderland, and a helicopter parent's nightmare.

One man's prolific, decade-long quest to turn trash into artistic treasure.

One man's personal collection of KGB memorabilia is presented along with his strange viewpoint.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Macabre astrological automaton clock dating to the late 1400s.

Steadily reminding Czechia of its past.

Microscopic scenes; some call it novelty, some call it art.

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

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

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

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

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