The sound comes from the Great Bell known as Big Ben inside the Elizabeth Tower at the Palace of Westminster in London, completed in 1859. Its deep hourly strikes and quarter chimes have been broadcast by the BBC since the 1920s, making it one of the most recognised time signals in the world. Online, the extended chime is widely shared as a standalone effect for projects needing an instantly recognisable symbol of Britain, London history, the passage of time or formal ceremony.