January 4, 2010: The world’s tallest tower, developed by Emaar Properties, was unveiled to a crowd of thousands and the world in a crescendo of fireworks, lasers and fountain displays. The official height of the tower, unveiled as ‘Burj Khalifa’, was announced as 828 metres (2,716.5 ft). A closely guarded secret, the official height of Burj Khalifa was flashed onto a giant screen...