Located in Black Canyon on the Colorado River, Hoover Dam is an outstanding achievement, noteworthy not only for its enormous dimensions, complex design, and intricate construction, but also for its illustration of man's outstanding ability to overcome the desert's summer sun, the vagaries of a treacherous river, and the extreme hazards of great heights on the chasm's sheer walls. You'll stop at the eastern edge of the chasm in Arizona, which provides fabulous views of the dam and Lake Mead, the world's largest man-made lake. In addition, there are fabulous photo ops of the new Hoover Dam Bridge. Before returning to Las Vegas, you'll stop at a local park, where herds of bighorn sheep often come down from the surrounding mountains to gather and graze on the sweet grass.