Inside Osaka Castle, you'll find a museum spread across multiple floors, each offering a glimpse into the castle's history and the Toyotomi era. Exhibits include armor, weapons, historical documents, and artwork related to the castle and its founders. You can also see miniature replicas of the castle and the surrounding city as it once was. The top floor of the main keep features an observation deck, offering panoramic views of Osaka. Don't miss the golden tea room replica, which showcases the opulence of the era. The museum provides an engaging and educational experience, bringing the castle's past to life.