From Salt flats to Salta (and then Buenos Aires) A few nights ago we huddled behind a woefully poor gas heater in another tour office awaiting a train to the Bolivian frontier town of Villazon. A Daily Telegraph article on the wall confirmed that we had just experienced three days in one of the most remote and challenging environments on Earth; especially difficult if you're barely equipped for a day out in Uckfield, let alone the high Andes. Arriving in Uyun...