Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

One man's swirling six-acre monument of stone.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

The remains of what was once the world's steepest passenger funicular.

This abandoned factory on the Hudson River once churned out a million bricks a week.

A 19th century hat factory still stands as a crumbling ruin in upstate New York.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Native Americans built this circle of stones, which was used to predict astronomical events.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

The drama of nature in full effect in this Nevada State Park.

The longest living non-clonal organisms on Earth.

Odd outsider art installations surround a Gold Rush-era ghost town.

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

The world's largest collection of fine-scale miniatures and one the nation's largest collections of antique toys.

This abandoned prison castle has become an imposing gallery of graffiti art.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A sprawling collection of over 106,000 toys from around the world.

Thousands of mounted insects, and some live ones, hide within an otherwise ordinary shopping mall.

A famous flea market artist's studio that's full of odds and ends.

A museum dedicated to the alleged Roswell Incident.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."