Funai Castle Ruins, Oita (府内城, Funai-jo) Funai Castle was built in 1562, then mostly destroyed in 1743. All that remains today is the moat and outer walls. It is located about a 10 minute walk from Oita Station and entry is free to the ruins. It is a popular spot for cherry blossom viewing and on a fine day you can see carp and turtles swimming in the moat.