Probably the world's most famous national park, if not the most photographed, Arizona's Grand Canyon did not achieve national park status until 1919, three years after the National Park Service was created. Some five million people visit it annually, to see its glorious canyon one-mile deep and ten miles across, carved by the Colorado River over millions of years. Visitors can take in both the South Rim, which offers the park's renowned panoramic views, and the North Rim, which is 1,000 feet higher and features wildflower meadows, aspen and spruce.
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