Facts about Big Ben
Often referred to as "Old Tom" or "Old Joe," it is around three quarters of the size of Big Ben.
The bell is better known by the nickname Big Ben, which is often mistakenly applied to the clock tower itself.
Big Ben can be used in the classroom to demonstrate the difference between the speed of light and the speed of sound.
In 2005, a terrorist manual was found in the home of Abu Hamza al-Masri, marking Big Ben, the Statue of Liberty and the Eiffel Tower as terrorist targets.
Baby Big Ben is the Welsh version of Big Ben at the pierhead in Cardiff.
A clock tower similar to Big Ben is the Joseph Chamberlain Memorial Clock Tower of the University of Birmingham, England.
Similarly, on Remembrance Day, the chimes of Big Ben are broadcast to mark the 11th hour of the 11th day of the 11th month and the start of two minutes' silence.
The name Big Ben was given to a 14.5 tonne (16 ton) hour bell, cast on April 10, 1856 in Stockton-on-Tees by Warner's of Cripplegate.
On August 11, 2007, Big Ben went silent and temporarily also stopped keeping time for maintenance that lasted one month.