The Torre del Cubo Monument · Langa de Duero, Tierras del Burgo, Soria Image of Langa de Duero, not of the place itself. An ashlar tower of quadrangular plan and some twenty-five metres in height, with walls up to two metres thick and a battlemented finish. Raised between the fourteenth and fifteenth centuries, it was declared a monument in 1949. Photo: Rowanwindwhistler (CC BY-SA 3.0) What to see and do in Langa de Duero