The 600-year-old walled city Ahmedabad was named India's first “World Heritage City” in July, despite warnings from some of UNESCO's own experts that it lacked a convincing plan for protecting its ancient citadels, mosques and tombs. The centuries-old city is one of the world’s most polluted cities, suffering from neglect, heavy traffic and a widespread trash problem. Locals who once tended to the buildings are now leaving in droves.