Perhaps Arizona's Grand Canyon National Park and its immense canyon, a mile deep and eighteen miles wide, is the most famous of all National Parks. This natural phenomenon is the product of thousands of years of the mighty Colorado River cutting its way through the earth, exposing many layers of the earth's crust. The parks three life zones support a wide variety of plants and animals. As your eye wanders you can see only a fraction of this extraordinary canyon and its overpowering impact at any given time or from any given spot.

Visit the Grand Canyon National Park Forum to ask questions about the park.