Introduction to Niangziguan Village: There are 24 giant ancient stone mills left on the rapid mountain wall in Niangzi Village. The rumbling sound of the large stone mills can be heard from a distance. Even today, when electricity is widely available, the big stone mill keeps turning day and night. People from all over the surrounding villages came to the village with their animals to grind rice and flour. Every household in the village has a homemade water-driven stone mill. There is no need to leave the house to process grain, which eliminates the hard work of pushing and grinding. In order to make it easier to find, the doors of each house are engraved with "No. 1 Mill, No. 2 Mill..." If you look for the person according to the mill number, you will definitely be able to find the right person.