BBC NEWS | Science/Nature | 'Lost towns' discovered in Amazon: "A remote area of the Amazon river basin was once home to densely populated towns, Science journal reports...Like medieval European and ancient Greek towns, those forming the Amazonian urban landscape were surrounded by large walls. These were composed of earthworks, the remains of which have survived. "
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It seems as though whenever an old city is unearthed they find a wall around it.
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