Tomioka Silk Mill in Tomioka city of Gunma prefecture is the first full-scale silk reeling factory in Japan. Meiji government emphasized export of raw silk and planned to build a model factory in the 5th year of Meiji (1872) as part of its policy to encourage new industry and to prevent mass production of inferior goods. Tomioka was chosen as the best location because of its ample supply of cocoons, water, and fuel. Female factory workers recruited from all over Japan came here to work in the mill.The large-scale elegant brick buildings were built in the style of "timber-frame, brick construction" by piling up bricks over timber frames. The reeling mill is 140.4m long, 12.3 m wide, and 12.1m high. At the time, this mill was one of the largest industrial facilities even in the world. Even after the operation ceased in the 62nd year of Showa (1987), Tomioka Silk Mill was preserved in good condition, and in the 26th year of Heisei (2014), it was designated as UNESCO's cultural heritage.