More than five million visitors make their way to Northern California's wine country each year. And this is the ultimate guide to the best wine-related spots to be found there. Throughout Napa, Sonoma, and Mendocino counties the intrepid authors drove, trekked, visited, sipped, tasted, revisited, took notes, and visited again. The result: an essential and selective resource for those passionate about wine. Here's the "where to" of the finest places...