The days of the factory tour seem to be behind us, but years ago they were more commonplace.
When I was a kid in 1965, I toured the Ford plant in Mahwah, NJ. I also had a plant tour of the GM Lordstown, OH plant when the first-year '67 Camaros and Firebirds were being produced. I toured the GM plant in Linden, NJ a couple of times, once in the early 1970's (I believe they were making Chevy Monte Carlos) and also in the early 1980's (Toronado, Eldorado, and Riviera). The tours were always fun and educational. I still recall the paint shop on the assembly line in Linden where they had a bake-sand-bake process to achieve a smooth shiny finish.
Have you ever toured a car factory? If so, when and where?