Undated file photo shows a bird's-eye view of the site of the Xanadu (Upper Capital) of the Yuan Dynasty (1271-1368) in Shangdu Township of Xilingol League, north China's Inner Mongolian Autonomous Region. Xanadu was inscribed on the World Heritage List during the 36th session of the UNESCO World Heritage Committee in St. Petersburg of Russia on June 29, 2012. [Xinhua/Jia Lijun]