* The Alchemist - the closest thing in my life to a religious text. Just a beautiful story that I can recall at any time for some calm.
* Desert Solitaire - just read this recently and it gave me an entirely new outlook on the relationship between humans and nature.
* Don Quixote - I was blown away by how a book that is ~600 years old could make me laugh and keep me interested. Changed how I think about people 'a long time ago' since they could enjoy the same books I do.
* House of Leaves - this one just split open my brain in an irreversible way, sort of like how you hear people describe certain drugs.