BIG BEN: Why to Visit it? Big Ben is thename of the large bell inside the clock tower at the‐ Houses of Parliament. Most peopleknow this tower by this name. But the real name is Elizabeth Tower. It was renamed in 2012 to celebrateQueen Elizabeth II's 60 years as queen. This is called a Diamond Jubilee. Before that, it was simply called the Clock Tower. The new name honors Queen Elizabeth. Elizabeth Tower is a Grade 1 listed building. It is considered to be of exceptional architectural and historical importance. The tower is 96 meters high and has four bells, each 7 meters in diameter. The clocks are accurate to two-tenths of a second and are chimed by a massive bell weighing 13.7 tons.