The world-famous Forbidden City in Beijing is a representative palace of Nine. In this magnificent imperial palace of China’s Ming (1368 - 1644) and Qing (1644 - 1911) Dynasties, the total number of the rooms is 9, 999 and a half. The three major halls - Hall of Supreme Harmony, Hall of Central Harmony and Hall of Preserved Harmony - are all of a height of 9 Zhang and 9 Chi (about 108.2 ft; Zhang and Chi are both ancient Chinese length unit). There are 81 doornails in nine rows and nine columns on each gate. The number of almost all the stairs is nine or a multiple of nine. Apart from the Forbidden City, the construction of the Summer Palace and the Temple of Heaven are also based on number 9.