My husband and I met at work and are therefore in the same industry. I think that's to our detriment because we can talk for hours about work and then there's no time to talk about the important stuff. We now have a pact not to talk about work beyond "how was your day" unless it's something really important and not shop talk.
I come from the land of Boeing so I'm used to not understanding what a lot of people do at work (two sisters and three BILs work there). That said, I'd probably go on a tour of a plant if it was someone I knew but would think it was weird if it was someone I didn't know. I think a plant tour would be interesting.