A formerly abandoned mental institute, now back in business.

Once the largest public hospital for the mentally ill was also surrounded by controversy.

These mouldering mansion ruins remember a time when the Catskills were nothing but luxury.

The remnants of a luxurious resort that saw its peak in the 1970s and 1980s has been abandoned since 2009, leaving behind the wreckage of both the hotel and a beautiful ice skating rink.

An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

This sprawling woodland estate was the brainchild of iconic American industrial designer Russel Wright.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

This abandoned Victorian-style house was built in 1884.

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.