Ogaki Castle came to be a full-scale defensive structure when the already existing fortress was expanded around the middle of the 16th century. In 1585, Toyotomi Hideyoshi, who was ruling Japan, recognized the strategic importance of the site, and had the donjon built. A donjon is a massive inner tower in a medieval castle. Besides the four-tiered, four-storied donjon, there are many turrets and castle gates, and the donjon was designated a National Treasure in 1936. It was destroyed by fire in the air raids of 1945 during WWII. The existing donjon was rebuilt in 1959. It houses a museum on the first to third floors, which exhibits various information on this region and has a space for children dedicated to the theme of science. The fourth floor is an observation level.
There was all sorts of cool stuff like swords, bows and arrows, rifles, historic armor and we had a good time playing with the demonstration exhibits.