The walled town and its two arches Monument · Retortillo de Soria, Tierras del Burgo, Soria Image of Retortillo de Soria, not of the place itself. The built fabric preserves intact a stretch of medieval wall and two of its four gates, flanked by large cylindrical towers: the arch of Sollera, of the fourteenth century, and the arch of Oriente, of the sixteenth. Photo: Rowanwindwhistler (CC BY-SA 3.0) What to see and do in Retortillo de Soria