Burj Khalifa is the world's , Middle Easts' and UAE's tallest building. It's height is 2717 ft. Almost 15 million gallons of water (from fountains) are saved and then used for irrigation purposes. It has the fastest elevators in the world with the speed of 10 meters per second. To reach at 140th floor it's elevator takes one minute only. The peak if Burj khalifa can be seen from 95km distance.