An artificial crater field that trained astronauts for lunar exploration.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

Ancient pueblos built into the base of a natural canyon wall.

A stealthy Apache hideaway that became the haunting site of a mass grave.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

The remains of this hell for leather wild west town can still be found in the Arizona desert.

Once luxurious, these oceanfront beach homes have been left to succumb to the elements as the beach is slowly washed away.

The ghostly remains of what was once the world's richest copper mine.

A modernist landscape of water and sci-fi concrete.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The Lowcountry color with the power to stop evil from entering a home.

Steam engines and conveyor belts are remnants of a genius system left in the middle of the Maine woods.

Must form and function forever remain at odds? Not if the Florida Department of Transportation has its way.

A unique collection of diving equipment spanning antiquity to the present day.

A Prada store in the West Texas desert that is never open for business.

Mysterious glowing orbs float through the desert night.

This South Carolina water tower is an icon of the city of Walterboro, but it also once served as the county jail.

This bare tree might not have leaves but it is constantly clothed in festive decorations left by mysterious local benefactors.

Despite being burnt down multiple times, the ruins of this South Carolina church are still standing.

In Florida, these naughty monkeys live on their own mini-monkey Alcatraz.

This 140-year-old beacon off the Florida Keys marks the wreck of a Navy ship that once roamed the Caribbean hunting pirates.

The jewel of western Mexico's archaeological legacy is this tiered circular pyramid now covered in grass.

These two giant boulders mysteriously perched on a 60-foot cliff may have been slung up there by a raging tsunami.

This lush Florida island is home to the ruins of a crooked ship breaker's tiny empire.