Odawara Castle Donjon ((小田原城) located at Jonai, Odawara, Kanagawa Prefecture of Japan. Odawara Castle is a landmark in the city of Odawara. The donjon was restored by 1706, but the rest of the castle took until 1721. Extensive damage occurred again during the 1782. Odawara Castle Donjon from the top floor of the tower, the Shogun Tokugawa I am in em Somai. Ever climbed to visit. The design of that period was restored. This tower is about 60 meters above sea level, so you can see the panoramic view of the Gulf of Sanga.