The big clock on the tower of the Palace of Westminster in London is often called Big Ben.
But Big Ben is really the bell of the clock
It is the biggest clockbell in Britain.
It weighs 13.5 tons.
The clock tower is 318 feet high.
You have to go up 374 steps to reach the top.
So the clock looks small from the pavement below the tower.
But its face is 23 feet wide.
It would only just fit into some classrooms.
The minute-hand is 14 feet long.