The history of Osaka castle is fascinating, but it is a reconstruction and lacking in some areas. I was most disappointed with the inside architecturally, which they didn't even attempt to model on the original castle. Instead it houses a modern museum. The castle is said to be, by many, the most formidable castle ever built in Japan. Externally the reconstruction completely looks the part and the workmanship is flawless.The views are spectacular and overall it is extremely impressive and worth a visit if you are in the area. The grounds are probably more interesting to a history buff as the layout of the original castle is pretty much intact and you can still see some of the original gates and stone walls. There is a lot of walking in the castle and the grounds. I recommend wearing a comfortable pair of shoes and if you have children; leave the stroller in the car!