Introduction to the Three-Door Opening: The unique design of the "Three-Doored Opening" is an architectural model that perfectly combines the needs of residents' lives, commercial transportation, and military defense with the specific terrain. The main city tower is a brick and wood structure, about 16 meters high. The ear towers on both sides are about 10 meters high. Brass bell. The ear cities on both sides are one-story, decorated the same as the main building, and can be used for garrisoning troops.