I have a 3 1/2 year old son, and he really enjoys seeing industrial sites and similar stuff. We've been to the dump a few times (which he loves) and we're going to go on a tour of the local sewer/water processing plant. He's asked to see a Car crusher. Does anyone know of one in Orange County/Southern California?
Also, I'm wondering it other people have some suggestions for places to take him. I think a machine shop would be fun for him to see, but, as far as I know, they don't usually give tours... So maybe a gravel pit or big recycling center? Ideally there would be some stuff moving around so he can see what's being done. For example I think a refinery would be a little boring for him. (Not when he's older and understands a little chemistry, though).
So, any ideas?