Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

This abandoned five-star hotel is now a five-star urban exploration destination.

Pensacola's UFO home has withstood many hurricanes—just as the experimental 1960s design intended.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

The world-record holder for the longest bridge stretching continuously over water.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

Concrete strongholds stand guard over the Golden Gate.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Four-story concrete hotel never opened to customers.

This Hawaiian cattle ranch acts as a museum devoted to the island cowboys that predate the wild west.

A controversial memorial at the place where Captain Cook met his violent end.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

Watch the newest land on the planet form before your eyes.

Built for the 1962 World Cup, this fully functioning botanical clock is still ticking.

The largest stone moai on Rapa Nui.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

Under the desolate and windswept northern coast of Barbados stands a small oasis filled with sea anemones.

This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

The oldest colonial fortress in the Americas was once the home and later prison of Christopher Columbus.