Big Ben is the name given to the Great Bell of the Clock in the Elizabeth tower that is situated in Westminiter, London.
The official name of Big Ben (Bell) is the Great Bell.
Technically, Big Ben is the name of the Great Bell inside the Elizabeth Tower. However, both the tower and the clock are normally called as the Big Ben.
Its construction was completed in 1859.
Before 2012, the tower was simply called Clock Tower.
In 2012, the official name of the tower was changed to Elizabeth Tower to celebrate the diamond jubilee of Elizabeth II.