London's Tower Bridge is one of the most recognizable bridges in the world. Its Victorian Gothic style stems from a law that forced the designers to create a structure that would be in harmony with the nearby Tower of London.
The proximity of the harbor and its location in the direction of the sea required for the bridge to allow the passage of large vessels. Hence the decision to create a moveable bridge which can be opened to accommodate boat traffic. The mechanism to open the bridge is hidden in the two towers.
Taking photographs of the Tower bridge is a favorite London tourist activity, but you can also go inside the bridge, where you'll have a magnificent view over London from the walkway between the two bridge towers.