I would definitely return to our old home in Ireland: we only lived there for one year, but it was the experience of a lifetime. There is nothing better than hillsides covered in heather and gorse on an Irish summer day!
I'm not sure if I would want to visit a place, but I wouldn't mind going back to Big Rapids, Michigan when I was 15. There were some things I did back then, that I would like to start over fresh. Make things even better with the friends that I made, and maybe even go on to finish high school so I could go on to college.
But, if you are just talking about revisiting a place without going back in time to that place. No thanks. If any place I would want to go back to Montreal, but that wasn't that long ago. Maybe visit Kings Island in Ohio. I haven't been there in years.