Beacon Towers in Hami There are totally 51 beacon towers of Qing dynasty remained in Hami. In arid and torried areas, beacon towers are usually built by laying Sun-dried bricks, while in comparably humid areas like Barkol and Yiwu, they are mostly built by ramming earth. These beacon towers are about 4-10m high, and their plane is basically square or octagonal. Today they have become famous local scenic spots.