Monument Valley is considered one of the natural wonders of the world because of the beauty of the free standing rock formations. It became popular film scenery after 1938 when John Wayne and director, John Ford came to the valley. Today, the land on Arizona - Utah border still belongs to the Navajo Indians and is a part of Navajo Indian Reservation.
Spanish explorers brought horses to North America in the 16th century. Some of them escaped or were released to the wild. Mustangs adapted themselves to the western habitat and multiplied in large numbers. Many of them were captured, domesticated, and bred by Native Americans.
Today, you can still find horses in Monument Valley.