North Brother Island

North Brother Island
Very much like, Poveglia Island that was previously on our list, North Brother Island is also, well, an island. But seriously, it is also an abandoned island, that once housed quarantine facilities. Typhoid Mary, the first known Typhoid case in the US, was admitted to the facility on North Brother Island. The medical nature of it clarifies why it was off-limits, even though it is deserted already, it remains barred to visitors.