The Wharncliffe Viaduct is a brick-built viaduct that carries the Great Western Main Line railway across the Brent Valley, between Hanwell and Southall, Ealing, UK, at an elevation of 20 metres (66 ft). The viaduct, built in 1836–7, was constructed for the opening of the Great Western Railway (GWR). It is situated between Southall and Hanwell stations. The viaduct was the first major structural design by Isambard Kingdom Brunel, the first building contract to be let on the GWR project, and the first major engineering work to be completed. It was also the first railway viaduct to be built with hollow piers, a feature which today has a colony of bats residing in it. Constructed of engineering brick, the 270-metre-long (890 ft) viaduct has eight semi-elliptical arches, each spanning 70 feet (21 m) and rising 5.3 metres (17 ft). It is 17 metres (56 ft) wide.
Brent Lodge Park is on the site of the former landscape park of Brent Lodge, created by the Rector of Hanwell. He acquired the house in 1795 and enlarged it, created a new driveway and landscaped the grounds, building a cottage orné in the east. Owners in the 19th century added a walled garden, stable block, greenhouses and other outbuildings, and ornamental tree planting continued. It became the home of Sir Montagu Sharpe and his wife, who eventually sold the estate to Ealing Council in 1931.
