Caojialu Yingcheng Site is located in Caojialu Village, Miyun County. It used to be an important gateway of the Great Wall. It is one of the four roads of Xixie Road, Jizhen. Miyun County leads to Xinglong and Chengde, Hebei Province. This site was built at the beginning of Hongwu Period, and rebuilt into Yingcheng in Ming and Wanli Periods. The city pool was built along the hills, with more than 6,000 meters around the city, three gates to the east, South and west.
The natural scenery of the past is a worthwhile journey.