In this Tuesday March 15, 2011 file photo, the official London 2012 Olympic countdown clock is attended to by technicians hours after it was started in Trafalgar Square in London. A year from now, London will be at the center of global attention when it hosts the opening ceremony of what organizers call the "greatest show on earth," the 2012 Olympics.. (AP Photo/Alastair Grant, File)
Featured Photo Galleries
