Origins trace to Higashi-Kurokawa-yakata, built in 1384 by Ashina Naomori. In 1590, Gamo Ujisato substantially rebuilt the castle with a seven-story keep and renamed the area from "Kurokawa" to "Wakamatsu." The Matsudaira clan (descended from Hoshina Masayuki) governed until the end of the Edo period. In the 1868 Boshin War, the castle held a month-long siege against imperial forces; after surrender, the keep was demolished in 1874. A five-story concrete reconstruction was completed in 1965, and in 2011 the roof was re-tiled in red to match the late-Edo appearance.
A teikaku-shiki layout — main bailey at center, with second, third, north, and west baileys radiating outward. The original seven stories were reduced to five for earthquake resilience. The red roof tiles are a rare regional type, specially fired to withstand Tohoku winters. The castle town itself preserves 90-degree street bends and blocked sightlines — a defensive layout designed for siege.
Through three phases of remodeling — Ashina, Gamo, Hoshina — the castle evolved from "defend from outside" to "endure under siege." Aizu samurai culture rested on the ethic of "protect the household to the end," and the castle's structure mirrors this faithfully. The 1868 month-long siege was, in effect, an empirical validation of this design philosophy (and it held).
Aizu is a case study in "how to operate a defeat." Most lost causes degrade into tourist clichés, but Aizu turned its loss into a moral identity — school, samurai sites, sake breweries, and the city's whole brand still operate inside that memory. Memory, when civically managed, behaves like brand equity for places that lost a war.
Take the loop bus to hit the main sites, then walk the bent streets on foot. Along Nanokamachi-dori, the lacquer shops and sake breweries are direct stakeholders in preserving the street pattern. The red roof under snow is unique. The concrete reconstruction has critics — but its symbolic value to the region remains substantial.