This is a hostile place, hardly accessible. Oxygen is scarce, the sun is violent and temperatures drop dramatically at night. Yet, these extreme conditions allow for one of the most remarkable habitats on earth. It's like a big Safari on this wide open high plane. And then there are those volcanic mountains with those colorful lagoons and once you catch a glimpse you can't let go. 4000, 5000, 6000 meters and counting ....