Nihonmatsu Castle Ruins

Nihonmatsu, Japan, Japan

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Nihonmatsu Castle Ruins are the remains of a large mountain‑to‑flatland castle in Nihonmatsu City, Fukushima Prefecture, in northern Honshū, Japan, which from 1414 served as the seat of the Nihonmatsu Domain and was home to the Date, Gamo, Uesugi, and finally the Niwa clans for most of the Edo period.

The castle was also known as Kasumi‑ga‑jō (“Mist Castle”) and Shirahata‑jō (“White Flag Castle”), and was built on a spur of the Adatara mountains beside the Abukuma River, along the historic Ōshū Kaidō highway between Edo and northern Japan, making it a strategically critical stronghold that controlled the main valley route.

Throughout the Sengoku period, the main enclosure was destroyed in battles and later moved to the lower base of the hill, where stone walls built by Gamo Ujisato and Katō Akitoshi were added, and although the castle was besieged and taken in a single day during the 1868 Battle of Nihonmatsu in the Boshin War, most of its structures were dismantled in 1872 after the Meiji Restoration, leaving mainly earthworks, moats, and stone ramparts.