The oldest of Japan's surviving castles, Inuyama Castle is a treacherous climb. You'll have to deposit your shoes at the bottom, and you can either navigate in your socks or the provided slippers. The steps are at least 15" apart straight up for each floor, and going down was the scariest part by far. Like Komaki Castle, there's very little to see inside the castle itself besides a few suits of samurai armor, some of the original glazed tiles and ornaments, and copies of photographs. However, they do provide volunteer guides in English. The view from the top is quite impressive, offering a grand view of the Kiso Kawa, "Japan's Rhine."