At the edge of the Andes lies the Quebrada de Humahuaca, a UNESCO World Heritage Site with multi-coloured sandstone formations.

The whole northwest of Argentina is filled with these striking quebradas (canyons) that start around Cafayate and continue north into Salta and the region of Humahuaca.
On the road to Purmamarca.
The Hill of Seven Colours (El Cerro de Siete Colores) lies just behind the town of Purmamarca in Northwest Argentina. Our guide spoke only Spanish but from what I could understand, the yellows come from sulphur, blues from copper, greens from iron or seaweed (?), reds from iron.
This trail leads around the Hill of Seven Colours. An adobe brick building in Purmamarca blends into the coloured sandstone surrounding it.
Cafayate just to the south not only has more of these unique coloured rock formations, it also has some early Incan ruins at Quilmes.As well, there are many wineries to explore that produce some of Argentina’s famous wines.

• For more on Cafayate: 2012/10/25/exploring-the-wineries-of-cafayate-in-the-northwest-of-argentina/
• For more images of this amazing region, plus a Humahuacan song to drink wine by: 
• For more on this challenge: http://ceenphotography.com/2014/05/20/cees-fun-foto-challenge-gound-rocks-sand-dirt-paths-walks-trails/