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The ancient Nabatean city of Petra lies in the barren desert of southern Jordan. Its ruins, spread across an area of over one square mile, include temples, a great theatre and hundreds of tombs built into the desert's rocky cliffs. Today, Petra attracts tourists in their thousands. But it also holds a mystery that has long puzzled historians. What could have led such a grand and elaborate city to be abandoned? After studying the latest evidence, Dr Tom Paradise proposes a new theory about its demise.