The world's largest building is part of the Dubai airport. It's 370 acres big, with, among other things, 157 elevators.
And, the Burj Khalifa, reputedly the tallest building in the world, more than twice as tall as the Empire State Building with more than 160 stories, is also in Dubai. Construction of the Burj Khalifa began at the beginning of 2004, and the building was completed in late 2009. More than 12,000 workers were employed at one time during the construction of the BK.