PICTURES: World Wonders Added to UN Heritage List

 PICTURES: World Wonders Added to UN Heritage List
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Pontcysyllte Aqueduct and Canal, U.K.

Despite its slender proportions, the circa-1805 Pontcysyllte Aqueduct in northeastern Wales (pictured) is large enough to carry boat traffic 11 miles (18 kilometers), soaring roughly 12 stories over rough terrain.

Recognized by the World Heritage experts as "a masterpiece of creative genius," the aqueduct pioneered the use of cast and wrought iron to achieve a robust yet elegant design. It remains the longest and highest aqueduct in Britain.
— Photograph courtesy Paul Highnam, UNESCO
 
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