Church of Nuestra Señora de la O (Sanlúcar) Monument · Sanlúcar de Barrameda, Costa Noroeste, Cádiz The church of Nuestra Señora de la O is the Iglesia Mayor of Sanlúcar de Barrameda and the main temple of its mother parish, of medieval origin, with a Gothic-Mudéjar doorway, whose fabric dates back to approximately 1360. It was declared a National Historic-Artistic Monument in 1931 and, as a Bien de Interés Cultural, forms part of the city's historic-artistic ensemble, recognised in 1973. c. 1360 Photo: Carlosrsc (CC BY-SA 4.0) What to see and do in Sanlúcar de Barrameda