Stack of cannon balls on castle roof, Castillo San Cristobal, San Juan, Puerto Rico, San Juan, Puerto Rico, Puerto Rico

architecture cannonball castillo san cristobal castle color image day fort historical landmark history large group of objects national park nobody old san juan outdoors photography pile puerto rico san juan san juan national historic site stack travel travel destinations vertical americas capital caribbean color colour daylight daytime fortress group heap historical island landmark mound outdoor outside park west indian west indies