These are images straight out of a doomsday movie: a huge storm front is gathering over the US city of Chicago. Then hail follows and lightning strikes the Willis Tower. Warren Buffett keeps ...

More than 1.7 million people make their way to Willis Tower's Skydeck Chicago each year, and it's easy to see why. Occupying the 103rd floor – that's nine floors higher than 360 CHICAGO – of ...