Things to do in  San Antonio de los Cobres

The star attraction of Argentina’s famous Train to the Clouds (Tren a las Nubes) is the mighty Polvorilla Viaduct (Viaducto de la polvorilla). At an altitude of 13,842 feet (4,220 meters), the 20th-century viaduct is the highest point of the railway route and affords spectacular views over the surrounding Andes.