Introduction to Dayan Ancient City: Dayan Ancient City is the ancient city of Lijiang, located in Lijiang City, Yunnan Province. Together with Langzhong of Sichuan, Pingyao of Shanxi, and Shexian of Anhui, which are also among the second batch of national historical and cultural cities, it is also known as the "most well-preserved" "Four Ancient Cities" is one of the two ancient cities without city walls among the famous historical and cultural cities in China.