1787929 Blackwall Tunnel: horse-drawn carriages pass through the entrance ceremonial opening of the tunnel, 1897 (b/w photo) by English Photographer, (19th century); London Metropolitan Archives, City of London; (add.info.: Blackwall Tunnel: horse-drawn carriages pass through the entrance ceremonial opening of the tunnel. The opening was attended by the Prince of Wales, later King Edward VII, and Princess Alexandria on 22nd May. Crowds of spectators gather to watch the event. Poplar, Metropolitan Borough of; Tower Hamlets, London Borough of); 穢 London Metropolitan Archives ; English, out of copyright.