I think it's possible I am the only person on the planet who had the privilege of visiting the movie set of Tombstone, in June of 1993, and then the competing Wyatt Earp set, the day after Thanksgiving of the same year.
This happened because of my therapist (long story). I arrived at Cook's Ranch-movie set outside Santa Fe, New Mexico as the guest of the production manger. He had purchased more than 70 copies of my recently published book, "The Illustrated Life & Times of Wyatt Earp" as gifts for his carpenters and crew, who had carefully built Dodge City, which had been grafted onto the existing set, complete with stockyards and shipping pens, at a cost of $2.5 Million. When I saw the ambitious sprawl for the first time, I gasped, "Holy Guacamole, you could rebuild my hometown of Kingman on Bell Road in Phoenix for $2.5 million!"
When I asked what they were going to do for the Tombstone scenes, he said dryly, "Oh, we just moved over a street." And here is that street, doubling as Fremont Street:
It was very cold on the set that day with a biting wind. Costner showed up around 2:30 and they filmed a cattle scene in a tiny corral. It's a transition scene and barely shows in the movie and I stood there freezing to death and watched them redo it a dozen times and I couldn't tell you what it was about.