Today we went on an excursion through the Quebrada de Humahuaca (Humahuaca gorge) by following Rio Grande (which is quite dry at this moment) up to the small town of Humahuaca. On the route we first stopped at Purmamarca - a little village famous for the Seven Coulour Hill next to it (Cerro de los Siete Colores). And indeed, the stones of the hill are really colourfull: varous tonalities of red, green, yellow, white, brown... This coloration seems to be result of oxidation of all kinds of minerals present in it: iron for red, copper for green, and so on. We then went on to Tilcara, driving through this valley, also famous in Argentinian history because of many battles against Spanish that took place during the struggle for indipendence. Tilcara has been declared the world heritage
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