This abandoned psychiatric hospital once housed more than 4,000 patients in the middle of a quaint New England town.

A once grand hotel is being retaken by the wilderness it once capitalized on.

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

This once luxurious Catskills resort is now a haunting ruin.

An abandoned castle owned and ignored by Masons carries a cursed history.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

Tucked behind New Jersey's abandoned Gingerbread Castle lie the eerie ruins of a once-flourishing paper mill.

A winding, cliffside stretch of road overlooking the Delaware River.

This mouldering abandoned mental hospital was once a center for progressive healing.

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

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

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

An abandoned asylum where patients have been forgotten but their possessions remain.

Home on the Hillside, and home of the first breakfast cereal.

An abandoned Victorian-era amusement park is rusting away amidst luxury houses.

Glass and concrete building designed by Albert Kahn.

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.

An abandoned stretch of highway, deteriorating next to the operational one.

The remains of a paranoid inventor's hidden workshop lie in beautiful ruins amidst a Canadian park.

A Canadian POW for German soldiers during WWII where prisoners hatched an elaborate escape plan.