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Bungo‑Taketa Station, Nagayu Hot Spring, Hakusui Dam, Takeda Castle, Funai Castle
The Oka Castle, now in ruins, is located in Taketa, Oita prefecture, Japan.
Oka Castle Wikipedia
Oka Castle has an extensive history. Sited on a mountaintop, it was originally built in 1185, for Minamoto no Yoshitsune. Shiga Sadatomo took control in 1332, and made many repairs and improvements. The castle was ruled by Shiga's descendents until 1586. At that point, it was taken over by Nakagawa Hideshige (in 1594) and more improvements were made, including an expansion. A main keep was added along with a palace. The Sankai turret (三階櫓), the castle's de facto Tenshu, collapsed in an earthquake, in 1769. Many of the buildings were destroyed by fire, in 1771, which had had originated in the castle town. The Nakagawa ruled until the castle until the Meiji Restoration. The castle was decommissioned in 1871, and in 1874 all the buildings were dismantled.
The current site only features some of the extensive stone walls which run for several kilometres There is a statue to Rentaro Taki on site.