Iglesia de San Juan Bautista (El Castillo de las Guardas) Monument · El Castillo de las Guardas, Sierra Norte, Seville Church probably of Mudejar origin with advanced Renaissance elements, an 18th-century main altarpiece and a 16th-century doorway. Photo: CarlosVdeHabsburgo (CC BY-SA 4.0) What to see and do in El Castillo de las Guardas