North Brother Island, East River, New York City, United States

After World War II, the island housed war veterans who were students at local colleges, along with their families. After the nationwide housing shortage abated, the island was once again abandoned.
In the 1950s a center opened to treat adolescent drug addicts. The facility claimed to be the first to offer treatment, rehabilitation, and education facilities to young drug offenders. Heroin addicts were confined to this island and locked in a room until they were clean. Many of them believed they were being held against their will (as one person wrote on the wall). By the early 1960s widespread staff corruption and patient recidivism forced the facility to close.
Now a bird sanctuary, the island is currently abandoned and off-limits to the public. Most of the original hospitals' buildings still stand, but are heavily deteriorated and in danger of collapse. A dense forest conceals the ruined hospital buildings, and from the 1980s through the early 2000s it supported one of the area's largest nesting colonies of Black-crowned Night Heron. However as of 2011 this species has abandoned the island for unknown reasons.