Introduction to Nagato Fort: Nagato Fort is a circular castle-like building with a diameter of 95 meters. It is composed of walls, barracks, playground, ammunition depot, and gun positions. The bottom of the exterior wall and the upper interior are made of large granite stones, and there is a playground of about 300 square meters inside. The entire fort is as solid as a rock and has a majestic momentum. It forms a horn with the nearby Litai Fort, Shema Fort, Huaiyu Fort, as well as the Langqi Island Gold Medal Fort and Yandun Fort across the river, guarding the first important pass of the Minjiang River Estuary.