Can't think of the name of it, but there's a book about an old-time Irish or Scottish village that appears through the fog every so often, and some guy from the present day finds his way there and falls in love...
And there's Somewhere in Time, by Richard Matheson, which was made into a movie. You can read at least some of it here: http://books.google.com/books?id=rSrP9s8DbSsC&dq=somewhere+in+time&printsec=frontcover&source=bll&ots=-J1HYrteAV&sig=KHUluaNAkOnx2hEYuOZV_bYzjfw&hl=en&ei=WKS9StIth6bwBpvP8aUB&sa=X&oi=book_result&ct=result&resnum=11#v=onepage&q=&f=false