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Photos: The biggest building in the world

The "New Century Global Centre" building 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

World's biggest building opens in China

The New Century Global Centre, which is fairly Chinese, as building names go, is now, officials claim, the world's largest standalone structure. Another claim to fame? An "indoor seaside" pleasantly free of smog.