Route 66 in Arizona is a ribbon tying together spectacular natural attractions such as the Grand Canyon, the Petrified Forest, the Painted Desert, and the Meteor Crater. There were plenty of man-made diversions along the way, too. Roadside businesses used Native American and Western imagery to lure travelers to fill up their gas tank, grab a meal, or spend the night. Roadside signs featured shapely cowgirls and big black jackrabbits, or warned of...