Japanese castles I've visited: #2 Akashi Castle in Hyogo Prefecture - which I've visited a few times. There's no main tower left, only turrets. It's located in a huge park right next to the train station.
Japanese castles I've visited: #24 Himeji Castle in Hyogo Prefecture. I think that's the castle that I've visited the most! I've been there a million of times - and it's certainly one of my favorite castles! :D