The ruins of Funai Castle are in downtown Oita City, though when it was built this was the coast. Some form of catle was here in the mid 16th Century, but its current form soidified at the end of the 16th century.
It is most famously known as one of Otomo Sorin's castles though he was defeated here by the Shimazu in 1586. Sorin is probably the most well known of the Christian warlords. Hideyoshi helped him retake the castle but later took the fief away from Sorins son.
Most of the castle burned down in 1743 and like most castles was decommisioned in 1872. The main gate and two towers were reconstructed in 1965 and in 1996 the covered bridge was restored.
It is now a free park and a popular spot for cherry blossom viewing.