"In his fading years, the American architect Frank Lloyd Wright embarked on a final grand project. Invited in 1957 by King Faisal of Iraq to design a new opera house, Wright expanded the brief into a plan for Baghdad complete with museums, parks, university and authentic bazaar. Dispensing with his 'prairie style', he peppered the scheme with domes, spires and ziggurats. The 1958 revolution meant that none of it was built. But the ever-resourceful Wright simply offered the design to a new client. And today, the Baghdad opera house is the Grady Gammage Memorial Auditorium at Arizona State University: an example of Wright's versatility and the forum for next week's presidential debate. Under the arches of a lost Iraqi skyline, George W Bush and John Kerry will meet in debate for the final time. "