The Train to the Clouds (Tren de las Nubes) is one of the three highest railways in the world. It departs from the city of Salta (at 3,894 f.a.s.l.) and ends its journey at La Polvorilla viaduct (at 13,850 f.a.s.l.). On its way, it crosses a road that takes to the clouds, with enough time to enjoy very different and …