One of the Cemestos prefab homes built to secretly house thousands of Manhattan Project workers.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

An abandoned relic of the city's failed experiment with below ground transit.

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

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

This charmingly homemade amusement park has been growing for 40 years.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

The only rotating bar in New Orleans has been slowly spinning since 1949.

The "Seinfeld" diner.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Ride the subways of yesteryear.

The secret city built by the Manhattan Project.

New York City's smallest piece of private property.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

Where beautiful signs live on forever.

The first declared National Monument in the United States.

The seamy, underground secrets of Portland's criminal past.

A beautiful Victorian-era cemetery, complete with a miniature village.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

A walk through the historic city center, under the streets of Seattle.

A tiny monument to the classic American candy.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

A creative deviation in this post office's design was once a source of controversy.