It is the uplift, and the down-cutting, that have created the Canyon. About five to 10 million years ago, the Colorado River began to carve its way down through the domed region on its way to the sea. Like a knife slicing through a layer cake, the mile-deep river canyon exposed multi-hued layers of time, a geologist's dream come true. But you don't have to be a geologist to appreciate the Canyon's grandeur. Erosion by wind, water, and gravity not only widened the canyon, it created an amazing variety of towers and spires, ridges and side canyons, shadows and highlights. The rainbow of rock colors is most intense in early morning or late afternoon light. If you are lucky, you will see a storm chase through the canyon, casting shadows and mist as it goes.

Sightseers have been coming to view the wonders of the Canyon since 1883. Prospectors soon found tourism more profitable than mining and built accommodations for them. One of the earliest visitors was Theodore Roosevelt, a lover of the West's wide-open spaces. He pushed for federal protection and in 1893 the area became a Forest Reserve. In 1908, it received a promotion to National Monument and in 1919 the National Park was formed.

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