Walls of Cuéllar Monument · Cuéllar, Tierra de Pinares, Segovia The walls of Cuéllar are a Romanesque-era military enclosure surrounding the old town of Cuéllar (Segovia), one of the most important walled complexes in Castile and León. They consist of three enclosures -town, citadel and counter-wall- plus the remains of a lost fourth, built from the 11th century and reinforced in the 15th by Francisco Fernández de la Cueva, Duke of Alburquerque and lord of the town. Of the more than 2,000 original metres, about 1,400 survive, one and a half metres thick; seven of the eleven gates remain, including the Mudéjar arch of San Basilio. Having lost its function after the 17th century, it suffered demolitions in the 19th, and the last restoration, in 2011, turned it into a tourist attraction. It was declared a national monument, today a Bien de Interés Cultural (Spain's highest level of heritage protection), in 1931. Photo: Lourdes Cardenal (Wikimedia Commons) (CC BY-SA 3.0) What to see and do in Cuéllar