Church of Yésero Monument · Yésero, Alto Gállego, Huesca Church of San Saturnino in Yésero, built in the 17th century over an earlier one of Romanesque origin, from which it preserves the tower and narrow windows; it has a single nave and a flat apse covered with a lunette vault. Photo: Willtron (CC BY-SA 3.0) What to see and do in Yésero