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While not one of the largest castles you will find in Japan, it is acknowledged as having the oldest existing donjon, built more that 450 years ago. It has also been designated a National Treasure. Erected on a small hill overlooking the Kiso River, it offers a panoramic view of Nobi Plain with Mt. Kiso Ontake and Mt. Ena visible in the distance. Unlike many other castles, Nagoya Castle included, which have been either restored or completely rebuilt, this is one place where you can see some of the real Japan of yore.