Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

A small "palace" and museum made of, and devoted entirely, to salt.

Once featuring over 60 miniature replicas of famous Chinese locations, the Splendid China theme park was completely abandoned and is now mostly rubble.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

San Francisco's newly reopened hands-on science museum.

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

Popular tourist destination where witches in dark hats sell dried llama fetuses for good luck.

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

San Francisco Bay's ghost town.

A 140-year-old castle with underground caves hidden in San Francisco.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A fifth-century temple improbably built into the side of a cliff.

Shop selling 500 flavors of soda has something for everyone.

One person's lost luggage is another person's treasure.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Once the most densely populated place in the world, this island is now a ghost town.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Site of a former hidden treehouse in New Orleans.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

A trash dump made beautiful by nature's power.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.