If traveling through AZ on Rt 66 you ABSOLUTELY MUST visit La Posada in in Winslow (https://www.laposada.org/). La Posada has a long, interesting history and is a short walk from the "standing on a corner" park (another must see - https://en.wikipedia.org/wiki/.....orner_Park). La Posada 2was originally a "Harvey House" inn on the railroad and it still serves as an Amtrak station. The restaurant inside, "The Turquoise Room" has an exquisite menu of hand crafted items created by the Chef using sustainable food items and local ingredients. The fried squash blossom appetizer is made using fresh blossoms grown in the hotel garden. VERY memorable.
Nothing at La Posada / The Turquoise Room is bad. This is a hotel with a long history or providing lodging for celebrities and dignitaries, many of which are memorialized on a photo wall. The hotel is a monument to days gone by - more like a museum than a mere hotel.
You MUST SEE this wonderful place if anywhere NEAR Winslow, AZ.
In NM there is a section of Rt 66 called the "singing highway" (). Rumble strips strategically placed on the road "sing" America the Beautiful as you drive that section of road. See this one quickly as the strips are wearing and the "music" will one day be gone unless funding to refurbish the rumble strips is found.
Grand Falls (AKA Chocolate falls) in Leupp, AZ (https://en.wikipedia.org/wiki/.....s,_Arizona). On the Navajo reservation north of Winslow (but no special reservation permit required at the current time). The falls is actually taller than Niagra Falls!!
One caveat - it only runs during wet weather.