Matsumoto Castle, originally known as Fukashi Castle, is one of Japan's premier historic castles, along with Himeji and Kumamoto. It is located in the city of Matsumoto, in Nagano Prefecture. The keep 天守閣 (tenshukaku), which was completed in the late sixteenth century, maintains its original wooden interiors and external stonework. It is listed as a National Treasure of Japan, and is one of the twelve remaining original tenshu in Japan