The Elizabeth Tower, commonly called Big Ben, is among London's most iconic landmarks. It was built in 1859. Technically, Big Ben is the name given to the massive bell inside the tower. It weighs more than 13 tons. The Elizabeth Tower stands 96 metres tall and has 11 floors. Dials of the clock are seven metres in diameter. An hour hand is 2.8m in length; a minute hand is 4.3m. The latin words under the clockface read Domine Salvam Fac Reginam Nostram Victoriam Primam, which means "O Lord...