This castle is one of the only 12 surviving castles in Japan. As for many castles you might have seen in many other cities, they are new. I mean they were re-built entirely from scrap.
The castle itself situated on top of the mountain. So, you need to walk quite a bit from the train station. It was a good exercise, plus you can enjoy great view of the japanese countryside. Upon arrival, you need to pay for the entrance ticket and you can ask for an english-speaking tour guide for free. These people volunteer to be your guide and tell you the history of the whole area, the city, and the castle. It was an amazing experience learning from someone who actually live in the area.
The surrounding area is quite lovely. You can have some quick meal and buy some souvenirs from the market in the area.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.