Roman mines of As Borreas Curiosity · Viana do Bolo, Viana, Ourense A Roman gold working in the parish of Caldesiños, where washing the ground away with water left a landscape of cuttings and channels that has been compared with Las Médulas; a viewpoint takes in the whole site. Photo: Estevoaei (CC BY-SA 4.0) What to see and do in Viana do Bolo