This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

A castle built for love, and abandoned due to heartbreak.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

Once America's longest-manned military fort, now an abandoned hulk.

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

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

Sniff the Titan Arum's rotting flesh.

For over 30 years the walls of this Harlem schoolyard have been a gallery of street art by "Kings and better."

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

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

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

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A crumbling hospital from the 1850s on Roosevelt Island.

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