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 killer snakes and prehistoric monsters. Between wails of Are we there yet? children pleaded to stay at motels shaped like wigwams, explore the...