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

The only one of New Hampshire's original 14 World War II watchtowers to survive in near-original condition.

Rising 30 feet in the air atop Quarry Hill, the Old Powder House is the oldest stone building in the state of Massachusetts.

Ruins of a once-prized railroad station in New York.

An abandoned gun-funded 19th century utopia.

A peaceful international sculpture garden in upstate New York.

Waterway populated with abandoned projects, including a submarine.

One of the oldest of its kind.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

An out-of-place Air Force radar dome is all that denotes this park as a former missile launch site.

A hidden piece of Altoona's railroad history in a long-forgotten abandoned town.

The remains of an old sawmill, gristmill and the surrounding industry dating back to the 18th century.

A lone tower rises above the cliffs in a city park, offering fantastic views of the Connecticut landscape.

This forgotten building was one of the few Philadelphia-area breweries to survive Prohibition.

An old abandoned mining town in The Adirondacks where Theodore Roosevelt first learned of the shooting of President William McKinley.

The world’s largest Masonic temple was saved by the White Stripes.

Hidden deep within New Jersey Pine Barrens is a massive graffiti wonderland.

A grandiose title could not save this mercantile community from obscurity.

This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

Landmark dedicated to the plight of the American Indian in the 21st century.

A museum that houses the world's largest collection of ventriloquism dummies.

The remains of a religious colony, its amusement park, zoo, and baseball empire.

This icon of the Atomic Age now lays dormant.