Located in eastern Utah, Nine Mile Canyon contains around ten thousand petroglyphs, some over a thousand years old. The earliest images are associated with the ancient native community called the Fremont (c. 950-1250 AD). Despite its name, the canyon is around 40 miles long, making it the longest art gallery in the world.
Measuring approximately 40 miles (64 km) long, Nine Mile Canyon consists of around 1,000 rock art sites with over 10,000 individual images.
Most images depict hunting scenes and animals such as birds, insects, lizards, and birds. Nevertheless, some images like the ones called ancient astronauts are hard to define. Today, most petroglyphs face the threat of erosion, airborne dust from the road, and, although not as extensive, defacement. Even though the road pavement project in 2013 helped cut down on road dust, the depictions still need preservation.
