Monastery of Santa María de Palazuelos Monument · Corcos del Valle, Campiña del Pisuerga, Valladolid The monastery of Santa María de Palazuelos, a Cistercian house founded by Alfonso Téllez de Meneses in the first third of the 13th century beside the Pisuerga river, between Corcos del Valle and Cabezón de Pisuerga, became the head of the Cistercian order in Castile, and its altar was consecrated in 1226. Of the three-nave church with semicircular apses, straddling Romanesque and Gothic styles, only the consolidated ruins of the church survive today, with capitals carved with sirens and dragons. A historic-artistic monument since 1931, it suffered the collapse of its roofs and a pillar in 1998, which led the Junta de Castilla y León to carry out emergency works; since 2012 a local association has been working, with support from the Diputación, on clearing the rubble and enhancing the site. Photo: Nicolás Pérez (CC BY-SA 3.0) What to see and do in Corcos del Valle