Grand Canyon is a steep canyon cliffs, carved by the Colorado River, in northern Arizona. This canyon is one of the Seven Wonders of the World and mostly located in Grand Canyon National Park; one of the first national park in the United States. President Theodore Roosevelt is one of the main supporters of the Grand Canyon, visited him on several occasions to hunt mountain lion and enjoy the incredible natural scenery.

This canyon, created by the Colorado River cutting a strait for millions of years, the length is approximately 446 km, with widths ranging from 6 to 29 km and a depth of more than 1,600 m. Nearly 2000 million years of Earth history has been cut by the Colorado River and its tributaries layer after layer of sediment as the Colorado Plateau began to rise.

Grand Canyon was first seen by Europeans in 1540, García López de Cárdenas from Spain. The first scientific expedition to the canyon was led by U.S. Major John Wesley Powell in the late 1870's. Powell refers to sedimentary rocks exposed in the canyon as "leaves in a great story book". However, long before that time, the region has been inhabited by Native Americans who built a residence in the canyon wall.

From : Wikipedia