China is building megacities like this at a pace and scale the world has never seen before. Chongqing has 12 million people and counting. It’s part of the central government's plan to bring some of China's economic boom to its impoverished interior province where three out of four Chinese live. Vanguard takes you on a whirlwind tour of the city---from inside a cramped boarding house where migrant workers to inside a starter apartment of China's new class of yuppies; from inside ancient, crumbling teahouses to gleaming new car factories.