Introduction to city gates: China's moon cities are all composed of two city towers and two city gates that lead directly to each other. The Moon City in the ancient city of Wei Qianzhou has three towers with three gates. There is a main tower in the middle and an ear tower on each side. They are laid out in the shape of "pin". The height and spacing of the main tower and the ear towers are perfect. This is Qianzhou has been world-famous for hundreds of years for its "Three Gates".