Roman tunnel of Barxa Curiosity · A Gudiña, Viana, Ourense Image of A Gudiña, not of the place itself. A gallery some twenty-five metres long and four wide dug by the Romans to divert the River Pentes and leave dry a meander in which they were prospecting for gold and tin; it survives beside the hamlet of Barxa. Photo: rmveiga (CC BY-SA 3.0) What to see and do in A Gudiña