The famous suspension bridge across the Thames, the Tower Bridge, a symbol of London, opened on June 30, 1894. The two sides of the bridge are tall towers built of granite and steel, majestic and heavy. The bridge is divided into two floors, the lower floors are for vehicles and pedestrians, and can be used to allow giant ships to pass. Tickets are required for the tower visit. The upper floor of the bridge is a suspended sidewalk, which allows pedestrians to enjoy the views of both sides of the Thames.