Introduction to Zhongtian Tower: Zhongtian Tower, also known as Sipailou, is one of the 12th floor of Langyuan. It is known as the "first floor of Fengshui in Langyuan". It was built in the Tang Dynasty and was demolished during the Republic of China. Zhongtian Tower is the Feng Shui coordinate and acupuncture point of Langzhong Ancient City. The streets of the ancient city are based on it as the axis and spread out in all directions in the form of "Ten Heart of Heaven Roads". It leads to North Street in the north, Shuangzhazi Street in the south, West Street in the west, and West Street in the east. Tongwumiao Street.