The walls and the Old Town at San Juan, Puerto Rico. The photographer is looking north from on the Old Town wall showing a muzzle loading cannon in the foreground aimed to the west to protect the entrance into San Juan Bay. In the left foreground is a pier built over a water pipe outfall. In the right background is the dome of the Cathedral of San Juan Bautista. Palm trees are growing to the south of the main El Morro Castle fortifications.