scenic viewpoint
Tren a las Nubes Viaduct Road
The RN51 climbs from Salta to the 4,200 m Abra Blanca alongside the Train to the Clouds line, passing beneath the spindly La Polvorilla viaduct at San Antonio de los Cobres. Paved most of the way, gravel near the top.
46 km · about 55 min drive