Big Ben, also known as the Great Bell of the clock tower at the Palace of Westminster in London, is a famous British icon. Standing tall at 316 feet, it was completed in 1859 and designed in a Gothic Revival style by Charles Barry and Augustus Pugin. The tower's four clock faces are 22.5 feet in diameter, making it one of the largest and most accurate clocks in the world. Renamed Elizabeth Tower in 2012, it leans slightly to the northwest and has a cool history, including a Prison Room where an MP was once locked up for not swearing allegiance to Queen Victoria.