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The dam wall of the Lac des Dix, pictured Monday, July 4, 2011 near Heremence in the Canton of Valais, Switzerland. At 700m length and 285 m high, it is the tallest gravity dam in the world and is part of the Cleuson-Dixence Complex. Construction on the dam began in 1950 and was completed in 1964, before officially commissioning in 1965. (KEYSTONE/Alessandro Della Bella)