A somewhat gentle introduction to fantasy, despite the occasional highly religious tone. The books start out good (four stars) and start to vary after around book four in the terms of quality (from two to three stars).
The Narnia series depicts the history of the otherworldy land of Narnia from the beginning of history to the very end.
The books in published order:
The Lion, the Witch and the Wardrobe
Prince Caspian
The Voyage of the Dawn Treader
The Silver Chair
The Horse and His Boy
The Magician's Nephew
The Last Battle