The castle tower used to splendid five story tower which stand on the southwestern of castle’s keep. But this tower was hit by lightning and burnt down.
They tried to rebuild but five story towers was prohibited with the low of One Castle per Province then.
Unwillingly, they rebuilt corner tower to build three story castle towers.
Hirosaki castle tower is not that big but it’s the only one castle tower in Tohoku area which rebuilt at Edo Period. This castle tower familiar as the Hirosaki Symbol.