Park Slope Library
Free entryPark Slope · Brooklyn
431 6th Ave, Brooklyn, NY 11215
Known as the "Prospect branch" until 1975, Park Slope Library's founding dates to a small collection of natural history books housed in Prospect Park's Litchfield Mansion in the early 20th century. A storefront library soon opened on Ninth Street until the beautiful Andrew Carnegie-funded building opened at its current location in 1906.