Have you ever seen a little piece of nature that seems completely different from the area around it? Maybe a fern-filled grotto around a spring in the desert? Or a wildflower meadow in the center of a dense forest? Enchanted places? Not far from Silver City, New Mexico, we found such a place in City of Rocks State Park. In the middle of a rolling grassy plain, an ancient volcano left behind a core of hard rock that had eroded and weathered into what looks like a city on the hill. It's easy to imagine a thriving city, magically turned to stone. Like all cities, it has streets and alleys, windows and doors. It's nicely landscaped, with wildflowers, live oaks, and desert plants. Rock City has quite a few permanent residents, although they are a little camera shy. Weathered rocks are a little like cloud formations, stimulating the imagination. If I stare at them for very long, I begin to...