Castillos califales de Espiel Monument · Espiel, Valle del Guadiato, Córdoba Image of Espiel, not of the place itself. The municipal term of Espiel preserves two fortifications from the Caliphate period: the castle of Cabeza de Vaca, with a quadrangular floor plan and corner towers, and the ruins of the castle of the Sierra del Castillo. Photo: Américo Toledano (CC BY-SA 4.0) What to see and do in Espiel