The tallest skyscraper in the world today is the Burj Khalifa, located in the United Arab Emirates (828 m).
The foundation of the Burj Khalifa was designed with piles and slabs. The 3.7-meter-thick slab resembles a three-petaled flower. The slab rests on 192 so-called "hanging" piles, each 1.5 meters in diameter and 43 meters long. These piles are not set into the rock because the Emirates are located in the desert, at a depth of 50 meters, where the soil is relatively soft.