The Doors of Perception & Heaven and Hell

First and foremost, I could hardly put this book down from first to last page when I first read it. Since then, I've read it a few more times and have decided this is definitely one of my favorite works of philosophy. The kind of book which made me questions the reality I knew. And at the same time, it reminded me of my "oneness" with sights, sounds and ideas around me. Aldous Huxley's writing style took me to a place I'd been to before. And explained to me the beauty of it in a way which blew my mind.
I highly recommend it for fans of psychedelic and new age ideas.