National Park Service: Route 66 in ArizonaFor centuries, travelers and explorers have been following the 35th parallel through Arizona. From prehistoric trails to Beale’s Wagon Road, the railroad, the National Old Trails Road, and Route 66, the 35th parallel through Arizona has been a favored route for its mild climate and relatively level terrain. Passing through numerous tribal communities and railroad towns, it is also a route of stunning natural attractions such as the Meteor Crater, Petrified Forest, painted deserts, pine forests, and the Grand Canyon. Curio shops and exotic animal farms once flourished along the corridor during the Route 66 years.