Not sure if Gibson still does tours of the factory in Nashville or not.
I know they have the Gibson Garage - but the factory itself I’m not sure if you can still go through the custom shop or not and see them as they are working.
Given the choice between looking at a bunch of overpriced new stuff in the “Gibson Garage” - I’d do Gruhn’s myself and see a bunch of overpriced vintage guitars and stuff and chance bumping into a famous musician or 2 while there.