The bridge over the Baos river Monument · Santa Cruz de Yanguas, Tierras Altas, Soria A rustic bridge of Roman make crosses the Baos beside the village, in a valley of leafy ash groves that was an obligatory passage for the flocks coming down from the sierra towards the winter pastures. Photo: Rastrojo (CC BY-SA 3.0) What to see and do in Santa Cruz de Yanguas