Castle of Jimena de la Frontera Monument · Jimena de la Frontera, Campo de Gibraltar, Cádiz Fortress dating in origin from between the 8th and 15th centuries, in a strategic frontier position, declared Monumento Histórico-Artístico (Spain's heritage designation in force between 1931 and 1985) in 1931, a category that Law 16/1985 transformed into Bien de Interés Cultural (Spain's highest level of heritage protection). declaración 1931 Photo: El Pantera (CC BY-SA 4.0) What to see and do in Jimena de la Frontera