Which book changed your (reading) life?

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I don't know how this was with you people, but when I was about 15-16, I read less than I used to as a child. There are great books for children, which really made me love to read, but at a certain age you just want something else. Unfortunately, I didn't find it. At the one hand, I was craving to read some 'real' books now, the literary classics, but I didn't dare because I thought it would be too difficult (well, not language-wise, but the content), for grown-ups. So all I was reading was the Harry Potter series. But then, in class, we were talking about the Middle Ages, and the teacher said, if we wanted to know more about it, we could read The name of the rose from Umberto Eco. As I was quite interested in Middle Ages those days, I went to the bib an read it, and what an experience that was! I loved everything about the book, right after I had finished it, I fetched Eco's other books, and there I went, on the dazzling train of literature :-) So, now I'm wondering, is there some book that has meant the same for you?