Ahmad Shah, the first independent sultan of Gujarat, built Ahmadabad as his capital more than 500 years ago. His successors were builders too. So were their wives, and so, even, were some of their retainers. And the Mughal viceroys who succeeded Ahmad's line built just as busily. The result of their labors was a city some compared with London, one rich with caravanserais, gates, gardens, water systems and, above all, beautiful mosques.