Quebrada de Humahuaca is absolutely beautiful. We travelled through countryside that was completely stunning. Deserts, cactus as far as the eye can see, colourful hills...a stream of breathtaking landscapes. To my mind the weirdest was the very tidily shaped hills coloured like rainbows - absolutely unbelievable. They are also called the Hornocal Mountains. They are a must-see during a trpi to Argentina. The colours are so bright that you almost wonder whether someone has been out with a paintbrush!
I recommend you take good walking shoes. Quebrada de Humahuaca is worth dawdling over, taking your time. It's nature's realm and you will feel very small.
Something that must be done if you love wide open spaces, desert landscapes and canyons. It gave me a foretaste of the bizarre scenery that we would find in Bolivia, which is very nearby.
I really enjoyed crossing Quebrada de Humahuacha because of the beautiful mountain scenery and especially the famous Hill of Seven Colours. From ochre to pink, via red - I counted, there were definitely 7!
This region is a sort of big valley several kilometres wide which you can walk over. Tilcara is a village in the middle of the Quebrada de Humahuaca. It seems to me the best place to visit the area from because it is close to the HIll of Seven Colours.
Although I wouldn't say the area is an essential part of a trip to Argentina I spent an enjoyable 3 days visiting it in a car I hired in Salta. If you decide to do the same thing then you should also go a little further north as far as the picturesque village of Iruya.