Guy Fieri travels this classic American highway for great food at great places: Homemade biscuits and gravy at a 60-year-old trucker's paradise near Victorville, Calif.; homemade German spaetzle and jagerschnitzel at an Oklahoma cafe built from rocks dug up in the construction of route 66; and apple smoked salmon and pecan crusted catfish at a Kansas joint in a former bank once robbed by Jesse James.