Tower Bridge is a combined bascule and suspension bridge in London, often mistakenly called 'London Bridge' by tourists. Built between 1886 and 1894, it was designed to allow river traffic to reach the London docks while maintaining road access across the Thames. The 'bascules' (the French word for see-saw) are the movable parts of the bridge that raise to allow ships through. Originally, they were powered by massive steam engines that pumped water into hydraulic accumulators; today, they are operated by oil and electricity. The bridge’s Victorian Gothic style was a requirement of the local government to ensure it harmonized with the nearby Tower of London. A unique feature is the high-level walkways, which allow pedestrians to cross even when the bridge is raised, although they were closed for many years due to their reputation as a haunt for pickpockets.