Castillo de Alanís Monument · Alanís, Sierra Norte, Seville Hexagonal-plan fortress with a keep and a barbican, built after 1386 on a hillock south of the town. Its walls are 2.3 m thick and 6.4 m high, and it suffered damage during the Napoleonic occupation. Photo: CarlosVdeHabsburgo (CC BY-SA 4.0) What to see and do in Alanís