Introduction to Yinyue Pavilion: On the outside of the southern cliff, there is a pavilion in the sky called "Yinyu Pavilion". There is a well below the pavilion, and a hole is drilled in the middle of the pavilion. It is said that on a moonlit night, if you sit in the pavilion and look down through the moon-viewing hole in the pavilion, you will see a hooked moon emerging from the bottom of the well, so it is called "Moon'er". well".