Uynui is a desolate little town on the edge of the great salt flats in Bolivia, which are more than 20 times larger than Salt Lake in USA. Stark, mysterious and sublime part of the Earth. In Uyuni the streets are dusty and cold, and there is a railroad graveyard on the edge of town with old locomotives from turn of century. The last train that Butch and Sundance is said to be in the heap of ruins here. From Uyuni you can jump on a overland trip in a 4WD Landcruiser to travel 3-4 days through high desert, salt flats, volcanoes to border of Chile at San Pedro de Atacama... Many overland outfitters out of La Paz, Bolivia and out of Uynui. Return trips are available too, coming from San Pedro Atacma, Chile. Contours and Amazonas are a couple. I went a few times with Ricardos, which is defunct now, but all run similar route. Camping and refuge accomodation. Real adventure.