Sometimes jobs or opportunities might be available. A lot of cities in the Great Lakes region of the U.S. were once booming metropolises, driven largely by the growth of industry, in states with ample farmland to feed their growing populations. But industries started to get outsourced overseas, and the affected cities experienced a slow decline.
Detroit is a particularly sad tale, as it was once the center of the U.S. automobile industry, but I've seen more recent videos where it shows street after street of nothing but condemned buildings or vacant lots. A lot of older cities are pretty rundown and deteriorated. Even Los Angeles has started to show signs of age.