It's amazing to think how quickly this city has grown. I met one woman who lived here in 1989. She told me that at the time, the Third Ring was the outskirts. Taxi drivers refused to go beyond it. Wolves were occasionally spotted in the nearby forests. Even Katie's Beijing guidebook, which was published nine years ago, shows the Fourth Ring as the edge of the city, and it only lists a couple of the central subway lines. Now, the Third Ring is downtown. Thirty-story highrises encompass it, and far beyond. The core of the city ends at the Fifth Ring, but a large population (including Katie and me) has spilled beyond even its reaches.