Kiryu Shinmachi Historic District

Kiryu made silk cloth for a thousand years and industrialised early, and the town still shows it. Honcho 1-chome and 2-chome, together with part of Tenjin-cho, are a nationally designated Important Preservation District — but unlike the post towns and merchant streets that usually get that status, what is preserved here is industrial: brick and timber weaving mills, storehouses, and above all the sawtooth roofs, rows of north-facing glass sheds built to flood a loom floor with even light that never moves.

The anchor is the Yurinkan, a group of eleven storehouses built between the Edo period and the Showa era for brewing sake, miso and soy sauce, in brick, timber and plaster. Five of them are now used as event and exhibition spaces, and the adjoining Yanoen serves tea and sells local goods. The district is a working part of town rather than a museum, so mills, houses and small workshops sit side by side and much of it is simply walked past rather than entered.

The sawtooth roof design that defines the district wasn't unique to Kiryu — versions of it appear in textile mill architecture across industrializing Japan and in Europe — but Kiryu's concentration of surviving examples is unusually large for a Japanese city. The north-facing glass panels solved a practical problem specific to weaving: looms need bright, even, shadow-free light to catch mistakes in the pattern as they happen, and skylights facing any other direction would flood the floor with harsh, shifting sunlight at certain hours. The saw-blade profile let mills stack these north-facing windows in a continuous row, lighting an entire floor evenly through the working day regardless of the season.

Kiryu's textile reputation once rivaled that of Kyoto's Nishijin district, and the two areas developed a long rivalry as centers of high-quality silk weaving, each associated with its own techniques and patterns. Kiryu's industry leaned more heavily into mechanized production earlier than many other silk-weaving regions, which is part of why the town's historic architecture skews industrial — brick mills and storehouses — rather than the wooden merchant houses and workshops more typical of preserved textile towns elsewhere in Japan.