No doubt the focus of a visit to Jordan's Petra. But as, for instance, operas, sometimes the opening is more impressive than the central plot. This is true to some extent in Petra. After the main entrance, and after weathering or accept kids who offered to make the trip by donkey, horse and buggy, the visitor arrives at the beginning of awesome "Siq" which at first seems a short step between rocks and soon discover as an immense crack in the sandstone that opens along a mile between steep cliffs which sometimes offer 200 meters high by only four wide. This is the path to the Treasury, the path permitted within the larger national park that is Petra. Desert Police with khaki green robes, their sashes, knives at their belts and rifles on their shoulders, are responsible for deter adventurous visitors camping in the mountains, as until recently used to. What tourists called Petra, is a fraction - the most spectacular - an area of 264 square kilometers, National Archaeological Park since 1993.