Introduction to Tangshu Grottoes: The cave number is 169. It was built during the Western Qin Dynasty (385-431 AD) of the Sixteen Kingdoms. It is about 60 meters above the ground. There are statues of the Western Qin Dynasty inside, with strong and straight shapes. The lines are smooth, the murals are painted, the composition is elegant, and the figures in the paintings are elegant and lifelike. There is an inscription in ink in the northern part of the cave, which reads "the first year of Jianhong" (420). It is the earliest cave inscription discovered so far.