Castle of Carles Monument · Alfara de Carles, Baix Ebre, Tarragona Castle of Andalusi origin predating the Christian conquest, with opus spicatum walls in its southern sector; the current upper and lower fortification dates from around the 13th century and is documented as a frontier castle in 1173, when the district formed a barony of the Sentmenat family. Photo: Profrob (CC BY-SA 4.0) What to see and do in Alfara de Carles