Medieval wall and Arch of Peace Monument · Palenzuela, El Cerrato, Palencia Image of Palenzuela, not of the place itself. Of the medieval wall that surrounded the town, the Arco de la Paz survives, one of its gates, beside the bridge over the Arlanza; the eleventh-century castle formed a triangle with towers at each of its corners. Photo: santiago lopez-pastor from España (CC BY-SA 2.0) What to see and do in Palenzuela