Mine of Valgrande Curiosity · A Gudiña, Viana, Ourense Image of A Gudiña, not of the place itself. A tin and wolfram working of Roman origin brought back into use in the 20th century, with a central chamber from which several galleries run; today it is flooded and is the chief testimony to the municipality's mining past. Photo: La fabrica de nubes (CC BY-SA 3.0) What to see and do in A Gudiña