North Brother Island, United States
North Brother Island is one of the most tragically beautiful mysteries of New York City. This abandoned island, which is located in between Riker’s Island and the Bronx, was once the home of Riverside Hospital. During the 19th century, people that suffered from diseases such as small pox, tuberculosis and yellow fever were quarantined to the island. After World War II the island became home to veterans. Eventually, it became a treatment center for heroin addicts. The hospital finally closed its doors in the early 19th century and it has been left in the hands of nature since.
The island serves as a nesting colony for black-crowned night herons, so public access is forbidden.