Eleven bridges built to carry water rather than traffic. The Pontcysyllte Aqueduct in Wales takes narrowboats 38 m above the River Dee, and you can walk the towpath across. The Orb Aqueduct carries the Canal du Midi at Béziers, and the C&O Canal near Washington, DC has two old stone ones at Monocacy and Seneca Creek. For the arches of Pegões, Skopje and Wachusett, the best view is from below.
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