Hara Castle Ruins

Hara Castle (原城, Harajō) stands as a powerful reminder of Japan’s turbulent past. Perched above the Ariake Sea, it was the site of the decisive battle during the Shimabara Rebellion of 1637–1638, where Christian peasants rebelled against harsh taxation and persecution. The castle held strong for over a year before it fell, its defenders killed and fortifications razed. Today, visitors can explore the castle ruins, including stone walls and gate foundations. A small park now occupies the main bailey, featuring a monument and a bronze statue of young rebel leader Amakusa Shiro.

Just two kilometers away, the Arima Christian Heritage Museum offers insight into Christianity's rise and suppression in the region. It houses artifacts found at Hara Castle, including crosses and rosaries, and a replica excavation site with human remains. Near Hara Castle lie the ruins of Hinoe Castle, once a key stronghold that was also attacked during the rebellion. Excavation has revealed remnants of its unique structure, including a staircase built from Buddhist gravestones.