Tower Bridge.

Tower Bridge is a source of never-ending fascination to visitors. Many who come to the Tower of London often wait a long time to see the roadway raised to allow an ocean-going ship to enter the Pool of London. Although the two bascules which carry the roadway each weigh over 1,000 tons, they can be raised in under two minutes. The Bridge was built between 1886 and 1894 by the City of London Corporation to link the southeastern suburbs with the city and eastern London. It cost over a million pounds.