There are 3 big ones - Himeji Castle is by far the most popular. It is the best surviving original castle in Japan. Almost all the others in Japan are recreations. Another excellent place is the Kokoen Garden nearby. It is one of Japan's finest. If you visit both, get the combination ticket and one of the places is almost free. These 2 can take up to half a day. If you want to make it a full day, you can go up the mountain to see Mt Shosha, with a large temple complex. You can see some previews at: https://goo.gl/65ZtRi
Comments
There are 3 big ones - Himeji Castle is by far the most popular. It is the best surviving original castle in Japan. Almost all the others in Japan are recreations. Another excellent place is the Kokoen Garden nearby. It is one of Japan's finest. If you visit both, get the combination ticket and one of the places is almost free. These 2 can take up to half a day. If you want to make it a full day, you can go up the mountain to see Mt Shosha, with a large temple complex.
You can see some previews at:
https://goo.gl/65ZtRi
Thank you for your recommendation