Castle of Cieza (alcazaba de Siyâsa) Monument · Cieza, Vega Alta del Segura, Murcia Islamic citadel on a crag of the castle hill, at about 500 metres above sea level, the most inaccessible part of ancient Siyâsa, which controlled the crossing of the River Segura and the surrounding roads. Photo: Pssia (CC BY-SA 3.0) What to see and do in Cieza