On this day in history, January 11:

President Theodore Roosevelt declared one of the major natural wonders of the world -- the Grand Canyon in northwestern Arizona -- a national monument in 1908.

With its mammoth size and depth, and the exposed layering of colorful rocks dating back to Precambrian times, the canyon was formed by the incision of the Colorado River, after the Colorado Plateau was uplifted and the Colorado River system developed along its current path.

Humans have continuously inhabited the region for at least 4,000 years. The oldest evidence of their presence is tiny split-twig figurines, animal figures just a few inches high, created from twigs of cottonwood or willow, and found in caves below the rim of the gorge. These early remains are nearly 12,000 years old, dating back to the Paleo-Indian period, and were fashioned by the people of the Desert Culture.

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