Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

The remains of a deserted 1800s farming community can be found in Little River State Park.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

A short hike into the mountainside forest reveals a decaying 1890s town.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

This crumbling UFO is one of only a few remaining "moveable ski chalets" of its kind.

A key producer of charcoal iron in the early 1800s, the structure still stands today.

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

A haunted hot springs hotel that went from healing retreat to asylum before it was restored.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

The location of Puerto Rico's first water bottling plant, thanks to a collaboration between Mother Nature and technology.

Tucked away on an empty wooded lot in suburban Oklahoma City lie the remnants of an abandoned circus camp.

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

The remnants of an early American attempt at missile defense.

The old Route 66 town straddling Texas and New Mexico died along with the Main Street of America.

A crumbling hospital from the 1850s on Roosevelt Island.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

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

This amazingly preserved Gold Rush town is a historian's dream.

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

Instead of becoming a power plant, this abandoned complex became a massive letdown.

A Beaux-Arts triumph set to become Ford's innovation campus