Introduction to Yunyan Tower: Yunyan Tower, also known as Manmengding Tower. Yunyan Tower was built in 1947 and completed in 1955. The bottom of the tower covers an area of ​​400 square meters and is a multi-story brick-concrete structure. It is composed of a main tower (20 meters high) and 40 small towers, all in a cone shape. It is located on Yunyan Mountain, 1 km east of Yingjiang County.