The La Polvorilla ("Tren a las Nubes") rail bridge, Peter Feibert at right, Salta province, Andean Altiplano, Argentina

The La Polvorilla ("Tren a las Nubes") rail bridge, Salta province, Andean Altiplano, Argentina

Sign describing the La Polvorilla ("Tren a las Nubes") rail bridge, Salta province, Andean Altiplano, Argentina

La Polvorilla ("Tren A Las Nubes") rail bridge, Salta, Argentina, on the Andean Altiplano (high plateau), the Andes Cordillera

La Polvorilla ("Tren A Las Nubes") rail bridge, Salta, Argentina, on the Andean Altiplano (high plateau), the Andes Cordillera

La Polvorilla ("Tren A Las Nubes") rail bridge, Salta, Argentina, on the Andean Altiplano (high plateau), the Andes Cordillera

Road, late afternoon, in the Chaco, Argentina

Road on the Andean Altiplano (Puna, high plateau), Argentina, the Andes Cordillera

Road that climbs the 'Cuesta de Lipan' to the Altiplano (high plateau) of Susques, Jujuy, Argentina, the Andes Cordillera

Road, Argentina, on the Andean Altiplano (high plateau), the Andes Cordillera

Road, Argentina, on the Andean Altiplano (high plateau), the Andes Cordillera

Road on the Andean Altiplano (Puna, high plateau), Argentina, the Andes Cordillera

The Andean Altiplano (high plateau), the Andes Cordillera

The Andean Altiplano (high plateau), the Andes Cordillera

Ice, winter on the Andean Altiplano (high plateau), the Andes Cordillera

The Andean Altiplano (Puna, high plateau), Argentina, the Andes Cordillera