Other than what has already been posted, I'll add:

Guns, Germs, and Steel: The Fates of Human Societies by Jared Diamond
The God Delusion by Richard Dawkins
The Good Soldier Schweik by Jaroslav Hašek
Love In The Time of Cholera by Gabriel García Márquez
Audacity of Hope by Barack Obama
I Know This Much Is True by Wally Lamb
East of Eden by John Steinbeck
Night by Elie Wiesel
Freakonomics by Steven Levitt and Stephen J. Dubner