The Flower Clock was built in 1950 and is one of the largest of its kind in the world, with a diameter of 40 feet (12 meters). More than 15,000 plants and flowers are planted twice a year, with different plants and designs for spring and autumn. The 24-foot (7.3-meter) tower behind it sounds the Westminster bell every 15 minutes. If the door of the tower behind the clock is open, you can take a look inside and see the clock mechanisms
