Castillo de Alcalá de Guadaíra y su casco histórico Monument · Alcalá de Guadaíra, Comarca Metropolitana de Sevilla, Seville Image of Alcalá de Guadaíra, not of the place itself. Fortress of Almohad origin with later Castilian rebuilding, located on the bank of the Guadaíra next to the old flour mills that harnessed the river's power for the local bread-baking industry. The old town was declared a conjunto histórico-artístico in 1984. Photo: Rojillo (CC BY-SA 3.0) What to see and do in Alcalá de Guadaíra