Old Tucson Studios

Old Tucson is an American movie studio and theme park just west of Tucson, Arizona, adjacent to the Tucson Mountains and close to the western portion of Saguaro National Park. Built in 1939 for the movie Arizona, it has been used for the filming location of many movies and television westerns since then, such as Gunfight at the O.K. Corral, Rio Bravo, El Dorado, Little House on the Prairie TV series of the 1970s–1980s, the film Three Amigos! and the popular film Tombstone. It was opened to the public in 1960 as a theme park with historical tours offered about the movies filmed there, along with live cast entertainment featuring stunt shows, shootouts, can-can shows as well as themed events. It is still a popular filming location used by Hollywood.

Source: Wikipedia