Polio Peak Nature · Mieres, Caudal, Asturias A 1,051-metre summit that crowns the Carraspientes ridge, on the eastern edge of the municipality. On its western slope were the mountain mines of Mariana and Corujas, the basis of the Fábrica de Mieres, and horses still graze on its high pastures. Photo: Pepeladillas (CC BY-SA 3.0 es) What to see and do in Mieres