Büyükkale Castle, locally known as Büyükkale Kalesi, lies on a hill, above the village of the same name, in the province of Izmir in Turkey.
I was not able to find any historical information about this castle. If you know something, please mail me.
Due to the types of masonry I suspect the castle was built before Byzantine rule, but kept being used and rebuilt by the Byzantines.
Not a very interesting site. The castle remains are just a few overgrown low walls. The site is freely accessible.