Introduction to Chenghai Tower: Chenghai Tower is located on a large platform in the middle of the city platform 20 meters north of Nanhaikou Pass. The building is 14 meters high and has two floors. Sitting north and facing south, there are plaques hanging under the eaves of the first and second floors. The first floor is "Chenghai Tower"; the second floor is "Hongjin Wanli".