Society of the Cincinatti

Anderson House, also known as Larz Anderson House, is a Gilded Age mansion located at 2118 Massachusetts Avenue, NW, on Embassy Row in the Dupont Circle neighborhood of Washington, D.C. It now houses the Society of the Cincinnati's international headquarters and a research library on 17th- and 18th-century military and naval history and the art of war. It is also open to the public as a historic house museum about life in Washington in the early 20th century.

Source: Wikipedia