Grand Canyon National Park
Becoming a park in February 1919, the Grand Canyon is a Wonder of the World as well as a UNESCO World Heritage Site.
Scientists estimate the canyon formed 5-6 million years ago, as the Colorado River carved its way through the rock. The Vishnu Basement Rocks, found near the bottom of the inner gorge, formed 1.7 billion years ago when magma hardened and joined the region.
According to tribal history, the Havasupai have lived in and around the canyon for more than 800 years. Much of their land was taken with the creation of the park, but in 1975 they regained a large portion. They make money from tourists, especially from Havasu Falls.
Now, on this day in history (2013), Nik Wallenda became the first person to walk a high wire across Little Colorado Gorge, which is near the park.
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