You are a guide. Give a short commentary on any well-known place of interest in London

- Big Ben is a tower clock. It is famous for its accuracy and for its 13-ton bell, designed by Edmund Beckett, Baron Grimthorpe. Big Ben is housed in the tower at the eastern end of the Houses of Parliament. The clock was named after Sir Benjamin Hall, commissioner of works at the time of its installation in 1859. Originally applied only to the bell, eventually it came to indicate the clock itself.

- Many important events in the history of Great Britain are connected with the Tower of London. It has served as citadel, palace, prison, mint, and menagerie. Now it is a museum. In 1078 William the Conqueror built the White Tower to defend the city. The Tower is famous for its illustrious prisoners. Many great people lost their heads on the executioner's block. The Yeoman Warders known as 'Beefeaters' guard the Tower. They wear traditional Tudor costumes.