The Colorado River started its work creating the Grand Canyon more than 20 million years ago.

Best National Parks of the West : TravelChannel.com

The Colorado River started its work creating the Grand Canyon more than 20 million years ago.

Grand Canyon Skywalk - A glass bridge is suspended 4,000 feet above the Colorado River on the very edge of the Grand Canyon.

Grand Canyon Skywalk - A glass bridge is suspended 4,000 feet above the Colorado River on the very edge of the Grand Canyon.

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