Remember the days when America was the biggest and best at everything?  When the World Trade Center, the Sears Tower and the Empire State Building topped the Guinness World Record Book lists of "World's Tallest Building?"  Well, a lot can change in a couple of decades.  First, the citylines of Asia reached for the sky, and left the USA in the dust.  Now, the place to go big is the Middle East – particularly the uber-rich country of Dubai – where the world's tallest building is nearing completion, and an even taller one is in the planning stages.