Agi Castle

Agi Castle is a hilltop fortress in Nakatsugawa built with stone walls and fortification structures that rise from the elevated terrain. The ruins display typical features of feudal Japanese military design with multiple defensive layers.

The fortress was built during the Sengoku period as a strategic outpost to control mountain passes in central Japan. It played a key role in securing trade routes and regional movements through its location.

The castle grounds reflect traditional Japanese military engineering with multiple rings of defense and carefully planned entry points.

The site is reachable via well-marked hiking trails that connect to several viewpoint locations. The best time to visit depends on weather conditions, as some paths can be difficult during rain or snow.

The castle's positioning at the intersection of mountain routes made it an essential checkpoint for controlling regional movement during feudal times.