Michelle Forsyth enjoys a spectacular visit to the America of canyons, cacti and cowboys. Eternal landscapes, infinite skies. That’s what you need for a backdrop, as those makers of classic Hollywood westerns understood, if you are to create myths on a scale that both magnifies and dwarfs us. The myths of humankind’s struggle with nature, of the elemental battle between the good and the bad, of the lone, pale horse rider and the pioneer settlement perched on the edge o...