The picture captured by NASA astronaut Don Pettit of the world's tallest building, Burj Khalifa, has surprised people. The ...

Within a three-week period, Adrian Smith sketched out the original designs that would eventually become the tallest building in the world, the Burj Khalifa. In the early 2000s, he was approached ...

Next in our 21st-Century Architecture: 25 Years 25 Buildings series we examine SOM's Burj Khalifa – the most significant building completed in 2010 and still the world's tallest skyscraper.