The Harry Potter books.
Most books I’ve read have some reason that I would not want to live in the world of the story. One of the most common reasons is that I would be forced to live with less technology and much more primitive medicine along with tremendous inequality between the sexes (and races, and everything else that goes along with living 50+ years ago). There aren’t a lot of books with plots far in the future that appeal to me. Another reason that living in many books is unattractive is that whatever makes the world in the story special make it unacceptably dangerous (for me).
In the Harry Potter books, I could presumably still live in the world of today, but there would be magic, too! It certainly makes the world a more dangerous place, but the increase in danger is offset by the awesomeness of the magic. Of course this is assuming I’m not a muggle. 🙂