The great bell clock at the North end of the Palace of Westminster has be renamed Elizabeth Tower officially on the event of diamond jubilee of coronation. It is the largest 4 faced chiming clock in the world. It was designed by Augustus Pugin. It is 315 feet tall and is 153 years old.
It is the iconic symbol of London and UK as a whole and a major tourist attraction but foreigner's are prohibited from going to the clock tower, english citizens can go with a letter of permission from their MP.