Castillo de San Romualdo

San Fernando, Spain, Spain

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Castillo de San Romualdo stands in San Fernando, Cádiz province, Andalusia, Spain, likely originating as a 12th- or 13th-century Islamic ribat—a fortified monastery blending convent and stronghold—near the Puente Zuazo to guard the island's sole land access.

First documented in 1268 under Alfonso X as "Logar de la Puente," it passed through noble hands like the Zuazo family and Rodrigo Ponce de León before serving as a key defense against the 1596 Anglo-Dutch sack of Cádiz, holding out for 13 days.

This unique Mudéjar rectangular fortress features a central courtyard, seven towers, and integrated chapel, now restored since 2015 as the city museum after centuries of military and residential use.