This former railway facility is the oldest in Slovenia, and now houses a museum showcasing the history of steam locomotives.

The costumes depict the Kurent, the star character of the annual Kurentovanje festival.

An otherworldly alpine pasture with its own unique microculture that recalls Middle Earth.

A miniature train-ride through Slovenia's largest cave system.

This abandoned Slovenian military barracks has become a punky-political art squat.

This massive subterranean fissure is known as the "underground Grand Canyon."

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

One of Europe's largest supercomputers is housed inside of a disused chapel.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

A museum dedicated to exhibiting remarkable outsider art.

An oddly poignant roadside attraction celebrating American folklore.

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

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

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

A master plumber has turned his love of art and toilets into a folk museum that's not taking the piss.

Florida castle built with aluminum printing plates.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

A self-built castle made by a mysterious man.

A miniature world of concrete and stone in Springfield, Ohio.

A hand-built folk art installation covered with messages of God's love.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

A piece of outsider public art accompanied by a strange urban legend.

The last funhouse of its kind, where guests enter through the mouth of an 80-year-old blue whale.

These tiny statues form a terracotta army from China's Han dynasty.