Taihe City Ruins, located on Taihe Street in Dali City, served as the early capital of the Nanzhao Kingdom (739–779 AD) and the first official royal city after Nanzhao unified the six tribes. Its walls were built along the foothills of Cangshan Mountain; today, only two sections of rammed-earth remnants remain on the north and south sides. Within the site stands the renowned Nanzhao Stele of Moral Transformation, bearing over 3,000 characters that record Nanzhao's relations with the Tang Dynasty, the events of the Tianbao Wars, and the kingdom's political system — earning it the title "History Book of Nanzhao." It was designated one of the first batch of Major National Historical and Cultural Sites in 1961.