The Chronicles of Narnia by C.S. Lewis is a great series of books for both the young and young at heart. If you want to discuss this book with your children, I also recommend ROAR! A Christian Family Guide to the Chronicles of Narnia. : )
"We spoke of Narnia in the days that followed. And when my cousins left, after the war ended, I missed them. With all my heart. Just as all Narnians will miss them. Till the end of time." I cannot vocalize how much that last quotes touches me.