The Historical Society of Washington, DC will reopen to the public on Sept. 19, 2017 at its temporary location in the Newseum, 555 Pennsylvania Ave. NW. Newseum will serve as the home to the Historical Society’s library and collections during the next 12 to 18 months to allow renovations of the historic Carnegie Library on Mt. Vernon Square by Apple. Admission to the Historical Society is free. dchistory.org.