Ajo Mountain Drive
Organ Pipe Cactus National Monument covers 516 square miles of Southern Arizona, so you could spend a month there and not see all of this isolated, biodiverse jewel of the national park system. But most people spend significantly less than a month there — and Ajo Mountain Drive is for them. Careful drivers can navigate this 20-mile loop in most vehicles, and it traverses much of what makes Organ Pipe great, including unique desert flora, steep mountains and dramatic views.