Nakatsu Castle in Oita offers a compact yet rich historical experience, from samurai artefacts and armour to panoramic views of Nakatsu city and the Nakatsu River. Its park, shrine, and surrounding museums make it a highlight for history enthusiasts and casual visitors alike.

Even in pouring rain, Imabari Castle’s seawater moat, towering stone walls, and coastal setting reveal why it is considered one of Japan’s great sea castles.