China starts work on world's tallest building

By Evie Liu, for CNNUpdated 25th July 2013
L-R: Sky City (proposed), China; Burj Khalifa, Dubai; Abraj Al Bait Towers, Saudi Arabia.
Shanghai's skyscraper-laden skyline inspires awe. And, sometimes, envy.
Shanghai's skyscraper-laden skyline inspires awe. And, sometimes, envy.
MARK RALSTON/AFP/Getty Images
Ten months from now and this site will be the cause of a lot of neck ache.
Ten months from now and this site will be the cause of a lot of neck ache.
STR/AFP/Getty Images
World's tallest buildings -- click to expand
World's tallest buildings -- click to expand
CNN