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Photos: The biggest building in the world

A water park is seen in the "New Century Global Centre" building which opens to the public in Chengdu, southwest China's Sichuan province on June 28, 2013. The center, claimed by Chinese officials to be "the world's largest standalone structure", measuring 500 metres in length and 400 metres in width, with 1.7 million square metres of floor space -- big enough to hold 20 Sydney Opera Houses -- is the latest symbol of China's economic boom. CHINA OUT AFP PHOTO