We visited Himeji-jo on a rainy, windy day when a typhoon was carving its way through the middle of Honshu. It is spectacular, set high on a hill easily seen from the train as you pass through Himeji. A 15 minute walk up the hill brings you to what was the middle moat (the outer moat was where the train station now stands!). It is empty of furniture, but contains samurai armour, ancient guns and weapons, writings and paintings of Daimyo.
Actually, it has a very warm feel to it, because of all the timber - a pleasant change to the cold stone castles of europe.
There are spectacular views from the 6th floor - just use your imagination to see all the people living within it's moats and walls.