Baoding, China

With over 11.5 million residents, Baoding is one of China's largest cities, but its bureaucracy is a persistent headache. The climate is harsh, with scorching summers and bitterly cold, dry winters. And while the city boasts a rich history and scenic landscapes, it also holds the dubious distinction of being the most polluted in the country. Baoding may appeal to those drawn to its industrial might and proximity to Beijing, but it's hardly an oasis of tranquility.