This railroad track was so secretive that it was omitted from all maps.

Stockholm's last remaining paternoster elevator.

A New York–based physician returned home to Spain to build his own elaborate monument to Christopher Columbus.

An enchanting work of outsider art, full of whimsical sculptures and carvings.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

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

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

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

A Jenga-style cylindrical tower of books that appears to go on forever.

Macabre astrological automaton clock dating to the late 1400s.

The first museum in the world devoted to sexual gadgetry.

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

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

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

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

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

This artificial cave looks like something out of a fairytale.

Walk through Czech history in Prague's largest graveyard.

A massive, abstract lookout tower providing a panoramic view of Prague.

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

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

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

Two monstrous faces loom over a village in Czechia.

This village in Bohemian Switzerland hosts more than 300 wood carvings inspired by fairytales, folklore, and other oddities, as well as a series of Communist-era tanks