Ruin..

Asturian rivers are almost all short and steep and narrow, and they provided the power that ground the millet, or spelt, or whatever cereal was being grown. The short stretch outside Viilaviciosa, between Valbucar and Buslaz, which is maybe 8 km long, has about a dozen such mills on it. 
This one,the Griselda Mill, is the first of them, actually in Valbucar, and is in better condition than some, worse than others. 
The graffiti is a later addition, and for a more natural, though less colourful view, I´ve put another photo of the same mill in extras.

https://www.cotoyapindia.com/2019/06/ruta-de-los-molinos-pr-ast-137.html