Introduction to Miyun Cave: Miyun Cave is located in the central belly of Dicui Rock. In ancient times, stone was used as the root of the cloud, and it was the cave where the fairy cloud was hidden. In the middle of the cave, there is a bluestone tablet with the word "福" written by Emperor Kangxi inlaid in it. Because Kangxi's handwriting has rarely been circulated in the world, this word "福" is exquisite in attainments and has broad meaning. It is a peerless treasure and can be called "the best blessing in the world".