Big Ben is the name given to the massive bell inside the clock tower of the houses of Parliament in London.
It weighs more than 14 tonnes, and has four faces that are illuminated at night. Each of the dials is 7 meters in diameter, and
half meters long! Big Ben was the installed in the middle of the 19th century. The name Big Ben actually refers to the clock's hour bell, the largest of the clock's five bells. The other four are used as quarter bells.