Also known as Funai Castle, Oita Castle was constructed by Takenaka Shigetoshi, who took over after Fukuhara Naotaka, the brother-in-law of Ishida Mitsunari who served under Toyotomi Hideyoshi. The main tower, or tenshukaku, has not survived to the present day but visitors can still marvel at the impressive stone walls, which served as the castle’s main line of defense, as well as side towers and the moat around the outer bailey. Oita Castle Ruins Park is also known as a popular cherry blossom viewing spot, where over 70 trees of beautiful Yoshino cherry flowers bloom every spring.