An urban laboratory.

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

A 16th-century horror show built in a lovely Italian garden.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

The fairy tale castle of the "fairy-tale king."

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Most-visited and most-photographed slot canyon in the American Southwest.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A bizarre house filled with an astounding array of collections.

An exquisite tunnel of cascading flowers.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A fiery crater has been burning in the Karakum Desert since 1971.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

A fantastical group of cliffside stairways, bridges, and twisting paths carved out of stone provide a surreal coastal hike.

This Japanese-inspired labyrinth of hot springs is hidden in a Chilean forest.

This odd Chilean waterfall-cano hotel must be entered via a rope bridge.

Rippling sand dunes frozen in the Arizona rock.

America's only nuclear missile silo open to the public.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.