1. Jefferson Market Library
The landmarked Jefferson Market Library that sits between Sixth Avenue, Greenwich Avenue and Tenth Street has a fascinating prior life. Designed by architect Frederick Clark Withers, the stunning structure was originally constructed as the Third Judicial District Courthouse and featured a prison next door where the garden is today (itself replacing a dingy police court over a saloon and a wooden fire tower).
In 1967, just under a decade after being saved from demolition through community efforts, the building was reopened as a New York Public library branch after a large scale restoration effort, estimated to cost roughly $1.4 million. The library officially opened its doors in 1967 and continues to remain in operation.