Marble Arch is a white Carrara marble monument that now stands on a large traffic island at the junction of Oxford Street, Park Lane, and Edgware Road, almost directly opposite Speakers' Corner in Hyde Park in London, England. Until 1851 it stood in front of Buckingham Palace. Historically, only members of the royal family and the King's Troop, Royal Horse Artillery, have been allowed to pass through the arch in ceremonial procession. The name "Marble Arch" also refers to the locality in west London where the arch is situated, particularly, the southern portion of Edgware Road. There also is an underground station named after it.