The vineyards and plateaus of the Duero Nature · Castillejo de Robledo, Tierras del Burgo, Soria The municipal district drops from the páramos towards the valley of the Duero at the point where Soria, Burgos and Segovia meet, with high-altitude vineyard, holm oak wood and limestone crags crowned by the ruins of the castle. Photo: Habibicb (CC BY-SA 4.0) What to see and do in Castillejo de Robledo