Which cities in Sichuan are called national historical and cultural cities?

Langzhong, formerly known as Yuen Long, is a famous historical and cultural city in China, an excellent tourist city in China, a national ecological demonstration city and a provincial health city. Located in the northern Sichuan Basin, the middle reaches of Jialing River, with Bashan in the east and Jianmen in the west, it has been the "important town in northern Sichuan" since ancient times. Langzhong city is surrounded by water on three sides and mountains on all sides. The water is in the mountains and the city is in the water. Zhong Ling, with its picturesque scenery, has been called "Yuen Long Wonderland" since ancient times. Langzhong Ancient City is located on the bank of Jialing River in the west of the city, and is known as one of the four ancient cities in China with Lijiang in Yunnan, Pingyao in Shanxi and Shexian in Anhui. The style is unique in China, and the peculiar geomantic pattern is unique in China's historical and cultural cities, so it is called "the land of geomantic omen".