I would guess that we all have had this experience. A very simple one that comes to mind is when I went back to my grade school. Everything was so SMALL. In this case, I had grown physically but there are other situations that give you the opportunity to see how much you have changed and grown (not necessarily physically.)
Maybe you have gone back to your home town where you felt no one liked you but what you realized is that wasn’t it at all… it was just that everyone was focused on themselves and their issues and it really had nothing to do with you. Or perhaps you realize, with age, that all those places you used to return to in your mind, that weren’t positive, really don’t matter anymore.
I would be interested in hearing how you have returned to a place and find out how you have changed.