|Sin City, China: Macau
I was sent to Macau, a special administrative region of China, for our continuing series on cities of the Orient. It's about 28 square kilometers (10.9 square miles). It is ranked the 4th densest city on the planet, which is an awfully small area for a population of half a million. Here are some interesting facts: Half of the world's population is within a 5-hour radius by airplane from Macau. Its gambling revenues surpassed that of Las Vegas by a couple of billion dollars in 2006.