On January 11, 1908, U.S. President Theodore Roosevelt declares the massive Grand Canyon in northwestern Arizona a national monument. Though Native Americans lived in the area as early as the 13th century, the first European sighting of the canyon wasn’t until 1540, by members of an expedition headed by the Spanish explorer Francisco Vasquez de Coronado. Whether as a National Monument, or a National Park, the Grand Canyon is above all a National Treasure to be cherished.