Firstly, let me say that I apologize for not posting in such a long while! My monitor is busted, and I've had to come to the Library (how nice!) to get online.
Now, let me say that I'm rather shocked that only one person so far has mentioned Homer's works!! I would think these nigh on canonical!! In addition to them, I would add:
Classics:
1. The Bible (Biblical allusions are ubiquitous in Literature).
2. The Divine Comedy of Dante.
3. Paradise Lost
4. The Pilgrim's Progress
5. Canterbury Tales
6. Le Morte D'Arthur
I suggest the above, because they are so often alluded to or imitated, that a good knowledge of their contents seems necessary to fully enjoy many later works.
Children's Books:
1. Charlie and the Chocolate Factory (or, anything by Roald Dahl)
2. The Adventures of Alice-Lewis Carrol
3. The Harry Potter Series
4. My Side of the Mountain
5. The Sign of the Beaver ( I apologize for my forgetting the authors' names).
6. The Lion, the Witch, and the Wardrobe (at least this, if no other Narnia books), by C.S. Lewis.
Fairly Modern:
1. Fahrenheit 451-Ray Bradbury
2. Anything from Steinbeck
3. Anything from Agatha Christie (she did revolutionize mysteries, after all!!).
4. The Lord of the Rings-Tolkien
5. The Great Gatsby