The Redwood Library and Athenaeum is a subscription library, museum, rare book repository and research center founded in 1747, and located at 50 Bellevue Avenue in Newport, Rhode Island. The building, designed by Peter Harrison and completed in March 1750, was the first purposely built library in the United States, and the oldest neo-Classical building in the country. It has been in continuous use since its opening. The building is part of the Kay Street–Catherine Street–Old Beach Road Historic District, and was designated a National Historic Landmark in 1960.