Marble Arch is a white Carrara marble (with some marble pieces extracted near Seravezza) 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 the City of Westminster, London. 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. Another attraction that’s the perfect 5 minute stop on your way to somewhere else.