The 2273㎥ Egawa Castle was constructed under the supervision of Morisada Uku, the 17th lord of the Goto family. It was destroyed by a fire after succession to the 22nd lord, Moritoshi Goto. A temporary encampment was built at Ishida Beach, designed by Shimanokami Hirotaka Terazazwa, lord of Karatsu Castle. Later, as the frequency of foreign ships increased, a greater need to defend the area emerged, leading to proposals to expand the scale of the Ishida encampment. Appeals were made to the shogunate to build Fukue castle, the castle walls and gates during the time of the Moriyuki Goto (28th generation), Morishige Goto (29th generation) and Moriakira Goto (30th generation). Castle construction began immediately after Morinori Goto (31st generation) received permission to begin construction in 1848. The castle was completed 15 years later in 1863, involving 50,000 workers at a cost of 20,000 ryo. The castle is a unique seaside castle, surrounded by the sea on 3 sides. It boasts a perimeter of 1,346 meters, measuring 291 meters from east to west. It was the final castle built during the Edo Era. Only 9 years after its construction and after the start of the Meiji Restoration, the castle was dismantled. Goto High School currently stands in the location of the inner citadel. Shiroyama Shrine, dedicated to the ancestors of the Goto family, a culture hall, and a historical museum stand in the area of the outer citadel. The Kedashi gate, stone bridge, castle walls and moat remain at the west end of the castle, reminding passersbys of these ancient times.