Completed in 1858, the clock tower was supposedly named after London’s Commissioner of Works, a large man called Benjamin Hall. Designed by architects Charles Barry and Augustus Pugin in classic Gothic Revivalist style, the brick and limestone tower rests atop Britain’s Houses of Parliament. The clock is the largest four-faced chiming clock in Great Britain. Each face is 23 feet (seven meters) in diameter and contains 312 pieces of opal glass.