The world tallest skyscraper: the world highest building will have 208 floors and 838 meters high. It is the Sky City, and its construction has just started in the central Chinese city of Changsha.

Changsha is a city near the Yangtze River. Until now, Changsha was only famous to have been the place where Mao Zedong studied in his youth.

Architects want that the building operates as a city, with schools, centers for the elderly and even a hospital.

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