The Kingdom Tower - in Saudi Arabia - plans to begin construction next week. At completion, it will be the world's tallest building, at a breathtaking 3,280 feet, with 200 floors. Currently, the tallest building in the world is Dubai's Burj Khalifa at a soaring 2,716 feet. These feats of design and engineering are mind-blowing! Check out the link below for more concept photos and info on this colossal build.