Alan Yentob profiles the most successful female architect there has ever been. Born in Baghdad in 1950 and based in London, Zaha Hadid is now one of a handful of global superstar designers who have changed the way people think about the world through buildings. Yet this hasn't always been the case; Hadid once had a reputation as unbuildable, a 'paper architect' whose projects began as vivid paintings of gravity-defying shapes exploding into the void. How did this extraordinary woman - by turns charming, stubborn, visionary yet exacting - come to build the impossible? imagine... visits her buildings across the globe - from Austria to Azerbaijan - to find out, as Alan Yentob explores what makes Zaha Hadid tick.