Better known as Big Ben (it's actually the name of the Great Bell!), this iconic clock tower which stands at the Houses of Parliament is officially called the Elizabeth Tower, named in honor of Queen Elizabeth II's Diamond Jubilee. When the Elizabeth Tower is open for tours, you can climb up the tower and admire the clock and bell up close. But fret not, you can still learn about its history and admire its ornate golden facade on a tour of London or the Houses of Parliament.