Big Ben is the nickname of a bell that hangs in the clock tower at the northern end of the Houses of Parliament in Westminster, London, England. Officially, the tower itself is called Elizabeth Tower. It was previously known as just the Clock Tower, but was renamed in September 2012 as a tribute to the Diamond Jubilee of Queen Elizabeth II. However, most people, including those that live in London, call the tower "Big Ben" because it is very large.