It is said that Arioka-jo Castle was the first castle in Japan that had a keep and in its precincts there are Inano-jinja Shrine, Fort Jorozuka, Fort Hiyodorizuka, Fort Koyaguchi and so on and it was a strong castle.
また日本国で最初の天守が備えていたと言われており、城内には猪名野神社、上﨟塚砦、鵯塚砦、岸ノ砦、昆陽口砦などが築かれており堅城であった。