1. The Grand Canyon stretches 433 kilometers through northwest Arizona where the Colorado River cuts through. 2. Though only 5-6 million years old geologically, the rocks at the bottom are almost 2 billion years old, showcasing different layers of rock in incredible colors that attract over 5 million visitors annually. 3. Surprisingly, the average visitor only spends 15 minutes viewing the Canyon despite long journeys, and visitors should be careful as 5 people fall over the edge every year.