The Burj Dubai is already the tallest building in the world. As of June it was 818m (2,683ft) high which is mind blowing to think about because the Sears Tower, the tallest structure in North America, is only 442m (1,451ft) tall. Its almost like stacking two Sears Towers on top of each other.
By the end of the project the Burj Dubai will have cost $20 Billion and include a 175 room Armani hotel, 144 luxury residential suites, 800 apartments, 4 swimming pools, a ballroom, and the highest public observation deck.
Surrounding the Burj Dubai will be the largest shopping mall in the world (1,200+ stores), 30,000 residential homes, 19 residential towers, and a 30 acre lake! All that being said, its a must see if you visit Dubai!