Here is a list of all the books I read during my four years of high school, assigned and for fun (note: this is completely off the top of my head, so it is likely I am missing a few). The highlighted titles were books that were not assigned...
A Clockwork Orange
Heart of Darkness
Cat's Cradle
Breakfast of Champions
Breakfast of Champions
Blood Meridian
In the Garden of Beasts
The Devil in the White City
The Stranger
No Exit
Death of a Salesman
The Future of Freedom: Illiberal Democracy at Home and Abroad
The Great Gatsby
A View from the Bridge
One Flew Over the Cuckoo's Nest
The Crucible
The Road
Persepolis
The Music of Chance
On the Road
Brave New World
The Adventures of Huckleberry Finn
Fahrenheit 451
Slaughterhouse Five
Girl with a Pearl Earring
Candide
To Kill a Mockingbird
The Martian Chronicles
The Color Purple
Romeo and Juliet
Macbeth
The Things they Carried
Lord of the Flies
1984
The Time Machine
The Catcher in the Rye
All Quiet on the Western Front
Narrative of the Life of Frederick Douglass
Black Swan Green
The Inferno
Into Thin Air
Pretty solid list, I'd say, though it should probably be longer. I didn't get into reading until junior year. I'll be back soon with a top ten list, as well as a list of the top ten books I hope to read in the near future.