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| Two of the more interesting tunnels that humans build are transportation tunnels for trains and cars and water aqueducts supplying large cities. The largest existing aqueduct in the world is the Thirlmere Aqueduct in North West England built between 1890 and 1925 and running 96 miles over and through hill and dale of the English countryside in pipes, streams, tunnels dams and aqueducts. |
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