Shrine of Nuestra Señora del Carbayu Monument · Langreo, Nalón, Asturias Dedicated to the patroness of the municipality, it preserves a medieval core enlarged in the 18th century on a height overlooking the valley; its September pilgrimage festival is the greatest devotional gathering in the Nalón basin. Photo: Yandrak (CC BY-SA 4.0) What to see and do in Langreo