Saudi Arabia will soon boast of the world's tallest tower.
The world's tallest tower is Dubai's masterpiece, Burj Khalifa.
Burj Khalifa is currently the tallest structure in the world, at a height of 829.84 metres (2,723 ft).
Sixty-five-year-old Adrian Smith, a Chicago-based architect has designed the Burj Dubai, the silvery, heat-deflecting skyscraper that rises to more than 2,600 feet.
Two skyscrapers were decimated the day 2,996 died, one and a half decades ago. George Joseph profiles the monument that has replaced them.