The Cenotaph is a war memorial on Whitehall in London. Its origin is in a temporary structure erected for a peace parade following the end of the First World War, and after an outpouring of national sentiment it was replaced in 1920 by a permanent structure and designated the United Kingdom's official national war memorial. An annual Service of Remembrance is held at the site on Remembrance Sunday, the closest Sunday to 11 November (Armistice Day) each year.