Plenty of old carney magic still haunts this photogenic amusement park.

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

Ruins of a once-prized railroad station in New York.

A museum that cashes in on its infamous little people while teaching you a thing or two about the Irish fey.

An 1814 castle that hosts an exhibit of "explorabilia".

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

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

A mining town once rife with murderous disputes over its copious treasures now creates income as a popular spot for photo shoots.

The liveliest ghost town in the state.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

Scattered around Atlanta are little doors with big charm.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

The ghost town that ended up on Ebay.

This abandoned mining village was predicted to resist decay longer than any other modern human settlement.

This old mining town, deep in the California desert, has a year-round population of one.

One of the ghostly stops along Route 66.

Made famous by cable TV, this oddball collection of antiques and collectibles is a cut above the rest.

Version of the French Riviera destroyed by the sea.

Hikers can still stroll beneath the long conveyer of this abandoned mining facility hidden in a West Virginia river gorge.

After an epic flood washed away its enslavers, this city has been part ghost town, part cultural wildcard for the past three centuries.

Planned as the world’s first zero-carbon city, it had lofty ideals—but is only 5 percent completed and aiming for 50 percent carbon-neutral.

Abandoned hotel with adjacent lake and golf course.

The secret city built by the Manhattan Project.

A small medical museum with a recreated doctor's office.