M writes: After the most horrendous 12hr bus journey from Potosi (Bolivia) we were mightily looking forward to arriving in what we had been told what a relatively comfortable part of South America: Argentina. But "fresh" off the bus, first we had to deal with customs and immigration in Villazon (Bol), involving joining a queue of literally hundreds of traders who constantly cross the border to sell their wares. Fortunately we were soon spotted by an immigration official who came and took our passports somewhere and disappeared, which is when we realised everything the books/websites tell you - never do this. Anyway, he returned, fortunately, and we crossed to La Quiaca in Northern Argentina (love these border crossings by foot!) where the police were far more formal, inspecting luggage minutely and remaining stony-faced throughout proceedings. I
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