Castillo de Cala rises on a commanding hill above the town of Cala in Huelva province, originally built by Muslims in the 11th century over Roman foundations. This rectangular fortress, measuring 64 by 51 meters, features four rectangular towers and three semicircular towers with walls two meters thick, representing the third defensive line of the Banda Gallega against Portuguese expansion. The castle underwent significant reinforcement between the 15th and 16th centuries to meet changing military requirements. Restored by the Ministry of Culture in 2010–2011, the castle now stands as a partially preserved testament to Andalusian defensive architecture.
