Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

A crumbling hospital from the 1850s on Roosevelt Island.

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

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

A tiny islet just off Long Island offers a wealth of infectious curiosities.

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

The once abandoned ruins of a Victorian beachside amusement park are now back in working order.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

House used in the 1971 horror film "Let's Scare Jessica to Death."

Quirky castle designed by the American actor best known for portraying Sherlock Holmes on stage.

This abandoned radar station from the Cold War era now only broadcasts a seriously ominous air of isolation.

Birthplace of America's first documented serial killer.

A New England ghost town features a trail of boulders etched with intriguing life lessons.

A mysterious air force base built to resemble a Long Island fishing village.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

The remains of a hospital ravaged by fire, once a progressive place of innovations for disabled children.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.