Castillo de Morón Monument · Morón de la Frontera, Campiña de Marchena y Morón, Seville 13th-century castle of Morón de la Frontera, which the Dukes of Osuna converted into a noble residence. Photo: Junta de Andalucía (CC BY-SA 3.0) What to see and do in Morón de la Frontera