Big Ben is the nickname for the Great Bell of the striking clock at the north end of the Palace of Westminster. The name is frequently extended to refer to both the clock and the clock tower The official name of the tower in which Big Ben is located was originally the Clock Tower. It was renamed Elizabeth Tower in 2012 to mark the Diamond Jubilee of Elizabeth II, Queen of the United Kingdom.
The tower was designed by Augustus Pugin in a neo-Gothic style. When completed in 1859, its clock was the largest and most accurate four-faced striking and chiming clock in the world. The tower stands 316 feet (96 m) tall, and the climb from ground level to the belfry is 334 steps. Its base is square, measuring 40 feet (12 m) on each side. Dials of the clock are 22.5 feet (6.9 m) in diameter. All four nations of the UK are represented on the tower in shields featuring a rose for England, thistle for Scotland, shamrock for Northern Ireland, and leek for Wales. On 31 May 2009, celebrations were held to mark the tower's 150th anniversary.
Big Ben is the largest of the tower's five bells and weighs 13.5 long tons . It was the largest bell in the United Kingdom for 23 years. The origin of the bell's nickname is open to question. It may be named after Sir Benjamin Hall, who oversaw its installation, or heavyweight boxing champion Benjamin Caunt. Four quarter bells chime at 15, 30 and 45 minutes past the hour and just before Big Ben tolls on the hour. The clock uses its original Victorian mechanism, but an electric motor can be used as a backup.
The tower is a British cultural icon recognised all over the world. It is one of the most prominent symbols of the United Kingdom and parliamentary democracy, and it is often used in the establishing shot of films set in London.
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