For now, the world's tallest building-to-be is just a flower-shaped concrete tattoo on the desert sands, but its pilings are already in place, plunging 160 feet into the earth. When it's finished, visitors will swoon over this city from 123 stories high, if not more. In fact the Burj Dubai will be much higher, the developers say - dozens of stories taller than skyscrapers in Taiwan, Chicago or anywhere else. But they are keeping the exact height a secret to flummox competitors in the world's furious race for the title of tallest skyscraper. "We're going to records never approached...