Conjunto histórico-artístico de Arcos de la Frontera Monument · Arcos de la Frontera, Sierra de Cádiz, Cádiz Image of Arcos de la Frontera, not of the place itself. The old town of Arcos, with its castle and the churches of Santa María de la Asunción (14th-15th c.) and San Pedro (15th-17th c.), was declared a monumento histórico-artístico (Monumento Histórico-Artístico, Spain's heritage designation in force between 1931 and 1985) in 1962, a category later converted into Bien de Interés Cultural (Spain's highest level of heritage protection). 1962 Photo: Menesteo (CC BY-SA 3.0) What to see and do in Arcos de la Frontera