The best work always comes from a collaboration of talented people. Thanks to Stephanie McComb, Chris Wolfgang, and the other editors at Wiley for their hard work of hammering, straightening, and polishing this book into what you see today. The National Park Service and other personnel at the sites mentioned in this book also deserve much credit: Over the years that I have explored these areas, I have come away impressed by their upbeat attitudes, knowledgeable guidance, and tireless patience. Thanks to the team at Any Chance Productions for their assistance and friendship, Abigail T. for being a great photography assistant, and to Fizzle for your patience and sage advice.