The remnants of an early American attempt at missile defense.

Former island in the Aral Sea used to be a top-secret Russian bio-weapons facility.

Less a museum than a bizarre fantasy world created by artists and engineers.

Starship-temple contains 400 tons of drinking water and offers free Japanese lessons.

Not one, not two, but three natural bridges remain in this captivating spot post-sinkhole.

Elevated freight railway turned wildly successful urban park.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

A magical place that lets you play in and explore the world of Studio Ghibli.

A white oak with property rights.

Secret Soviet city once home to Russian cosmonauts and space training facilities.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A geological bull's-eye visible from outer space.

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

Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.

These eclectic homes nestled into the cliffs of a Caribbean island were built entirely from scavenged materials.

The most alien-looking place on Earth.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

A giant gun barrel in Barbados that once hoped to shoot outer space with science.