Tower Bridge is a double-leaf bascule (drawbridge) that spans the River Thames between the Greater London boroughs of Tower Hamlets and Southwark. It is a distinct landmark that adjoins the Tower of London. Between the towers stretch a pair of glass-covered walkways that are popular among tourists. The walkways were originally designed to allow pedestrians to cross even while the bridge was raised, but they became hangouts for prostitutes and thieves and so were closed from 1909 to 1982.
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