Octagon Tower, ca. 1970.

The Blackwell's Island Asylum opened in 1839. The first lunatic asylum in the city of New York and the first municipal mental hospital in the country, the facility on Blackwell's Island (later Welfare, now Roosevelt Island) was designed by Alexander Jackson Davis. Nearly from its opening the institution was plagued by overcrowding, under-funding, and scandals. In 1887 Nellie Bly, a reporter, entered the hospital under the guise of insanity on assignment from newspaperman Joseph Pulitzer. Her resulting report, later published as "Ten Days in a Mad-House," exposed and embarrassed the institution and was a major factor in its closure. Beginning in 1894, the institution slowly emptied, continuing until the final patients were moved to new facilities in 1901. The building was then taken over by Metropolitan Hospital, which remained on the island through 1955.

The Octagon Tower is the only surviving structure of the original building. It was the main entrance to the Asylum. After the Metropolitan Hospital vacated the building in the 1950s it remained vacant and was left to deteriorate. The wings of the structure were demolished and the Octagon Tower was in rough shape (seen here) when it was placed on the National Register of Historic Places in 1972. In the early 2000s the building was restored and opened as the entrance to a pair of large adjacent apartment buildings.