You can tour the Ford River Rouge truck factory, which is where they make the F-150 and F-150 Lightning (PS you can spend an entire weekend at the Henry Ford complex - the whole thing is outstanding):
I went on a tour of the VW Dresden factory back when it produced the Phaeton and Bentley Continental. It looks like they currently produce the ID.3 there and are still doing tours:
Anyone can sign up for the Porsche factory in Stuttgart, Germany or the MINI plant in Oxford UK, there are probably many others too. Stuttgart is really dominated by Porsche and Mercedes-Benz, there's an giant M-B star on the town's big clock tower. It's a very business-y town but a nice visit for a car nut.
https://www.thehenryford.org/visit/ford-rouge-factory-tour/h...
I went on a tour of the VW Dresden factory back when it produced the Phaeton and Bentley Continental. It looks like they currently produce the ID.3 there and are still doing tours:
https://www.glaesernemanufaktur.de/en/your-visit/our-tours.h...