Medieval wall and tower of Llanes Monument · Llanes, Oriente, Asturias Of the enclosure raised in the 13th century, after the settlement charter granted by Alfonso IX, what survives is above all the northern stretch of a perimeter of around 840 metres; its round tower was declared a Monumento Nacional (Spain's heritage designation in force until 1931) in 1876. Photo: Wikipedia / Wikimedia Commons (CC BY-SA) What to see and do in Llanes