The Memorial Continental Hall in Washington, D.C. is the national headquarters of the Daughters of the American Revolution (DAR). It is located at 1776 D Street NW, sharing a city block with the DAR's Administration Building was built in 1920, and Constitution Hall. Completed in 1910, it is the oldest of the three buildings. It was the site of the 1922 Washington Naval Conference, a major diplomatic event in the aftermath of World War I. The building was declared a National Historic Landmark in 1972.