Ancient Persians built gravity-fed tunnels that still deliver water after 3000 years. #history #ancienthistory #engineering | Historic Marks
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Ancient Persians built gravity-fed tunnels that still deliver water after 3000 years. #history #ancienthistory #engineering | Historic Marks
Historic Marks. . Ancient Persians built gravity-fed tunnels that still deliver water after 3000 years. #history #ancienthistory #engineering
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