Reasoning that Hogwarts would date back to the medieval era, production designer Stuart Craig (The English Patient) fashioned Hogwarts' Great Hall after England's greatest cathedrals. Like all the other sets, it was built at Leavesden Studios, a former airfield outside London. "The architecture is real," says Craig, "but pushed as much as we can, expanded as illogically huge as we can possibly make it." To save money, the producers initially asked Craig to find an existing old English street to double for Diagon Alley, where wands, owls, cauldrons, broomsticks and other magical paraphernalia are sold. This was a tall order, since the row of shops would be Harry's--and the audience's--first glimpse of the world of wizards. (Upon seeing it, wrote Rowling, "Harry wished he had about eight more eyes.") Craig ended up building his own awe-inspiring version--a long, highly stylized cobblestone street of Tudor, Georgian and Queen Anne architecture. "The buildings are leaning to the point where they would actually fall over," says Craig, "and you would never get that many styles jammed together."