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BigmanPigman

(53,429 posts)
6. Not quite walls but sort of.
Mon Jun 10, 2019, 10:53 PM
Jun 2019

They weren't high like walls but tall enough to form a trench on the top. The Romans invented a kind of concrete that would be hard in water and a zillion other building and engineering techniques two thousand years ago. Their empire was partially harmed when the Huns destroyed the aqueducts they had built throughout Europe and their empire.

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