The Aci Castle is located in Aci Castello, in the province of Catania. The fortification, of uncertain origin, was the focal point of the development of the "territory of Aci" in the Middle Ages. During the Sicilian Vespers, it was subjected to the lordship of Ruggero di Lauria, then in the Aragonese period it belonged to Giovanni di Sicilia, and finally to the Alagona family, being besieged multiple times. Currently, it houses a civic museum. (Entry from the Italian Wikipedia page, CC BY-SA. Location reported by the OpenStreetMap community.)
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