Tower Bridge is a combined bascule and suspension bridge over the River Thames. It is close to the Tower of London, which gives it its name. It has become an iconic symbol of London and is sometimes mistakenly called London Bridge, which is the next bridge upstream.
Construction started in 1886 and took eight years, employing five major contractors and 432 construction workers. Two massive piers, containing over 70,000 tons of concrete were sunk into the river bed to support the construction. Over 11,000 tons of steel provided the framework for the towers and walkways. This was then clad in Cornish granite and Portland stone, both to protect the underlying steelwork and to give the bridge a pleasing appearance.