Petra is the world's oldest known town - and now we know a little bit more about it. It's best known for the sandstone canyon, but 2,000 years ago it was known as a famous water stop. Now they have found it had gorgeous irrigated gardens...and apparently a near (modern) Olympic size swimming pool. It was conspicuous consumption at its finest: We have so much water we can actually jump in it. This in a place which gets 10 to 15 centimeters of rain a year...
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