From the very beginning Wawel Cathedral has resounded with the sound of ringing of bells. Currently there are nine bells in its two bell towers. Five larger bells with the most famous, Sigismund Bell, hang in the Sigismund Tower. Four smaller bells hang in the Silver Bells Tower. The third tower, known as the Clock Tower, houses the clock mechanism and two gongs which strike hours and quarters of an hour. Thus we have eleven magnificent works of foundry art at the Cathedral which were successively created from the 13th to the 21st century and have survived to our times.