On February 26, 1919 President Wilson signed the Congressional Act that designated the Grand Canyon as a National Park

Today, around 5.5 million people each year see the 1 mile  deep (1.6 km) Grand Canyon each year. The canyon is 277 river miles (446km) long, and up to 18 miles (29km) wide. The Colorado River runs through the canyon and it created the canyon over millions of years.