There's a drippingly sentiment, nostalgic tune called 'Wickerman' on the Pulp album 'We love life'. It's all about going home to Sheffield and following the river.
I feel like that (well, not Sheffield, obviously, since I never lived there) quite a lot of the time. Nostalgia seems to me to be a natural state of mind. I think I first noticed it when I moved to Philadelphia in 2001.
It's quite ridiculous. I even get nostalgic for Leeds, and I really didn't like Leeds very much.