Big Ben is a famous four-faced clock located in London that has been standing since 1859, with each clock face being 49.15 meters wide and the figures on top standing 0.6 meters tall. The Tower of London was built in 1066 as a fortress and prison under William the Conqueror and now serves as a museum that houses ravens and Beefeaters. Tower Bridge spans the River Thames, first opening in 1894 with two towers that allow for both road and river traffic as well as pedestrians crossing at a height of 244 meters.