Hammer forge of Mazonovo Monument · Santa Eulalia de Oscos, Eo-Navia, Asturias A water-powered ironworks from the beginning of the 18th century, restored in 1993 and working once more, whose 114-kilo hammer is still driven by the force of the river; it is one of the last active water-powered forge hammers in Europe. Photo: Jorgechp (CC BY-SA 3.0) What to see and do in Santa Eulalia de Oscos