MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Canal barges crossing the Pontcysyllte Aquaduct, near Llangollen, Clwyd, Wales, UK. The aqueduct, built between 1795 and 1805, was designed by Thomas Telford to carry the Shropshire Union canal over the River Dee, 40 metres below.
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