Three Bridges, London

Three Bridges, known formally as Windmill Bridge, is a three-level crossing of transportation routes in Southall, west London, England. Despite its name, the landmark features only two bridges—a road bridge over a canal, which is carried in an aqueduct over a railway, which is in a cutting. A road bridge spanned the canal since the early 18th century but the structure was replaced when the railway was built in 1856. The road bridge is a cast-iron arch and the aqueduct is a cast-iron trough, all supported by brick piers, abutments, and retaining walls. The crossing was designed by Isambard Kingdom Brunel, the last major project before his death. The site is a scheduled monument.