Anyway to get back to the OP's question ...
I had to have The Lord of the Rings Trilogy by J. R. R. Tolkien.
I'm not a huge fantasy reader (I read lots of different genres) but it is a set of books which I've been reading again and again since I was about 12. I like the fact that they take me a very long time to read and because they are so long and descriptive it feels like I'm almost reading them anew every couple of years.
A close second would be Journey to the Centre of the Earth by Jules Verne as I've always liked adventure books. A short read but exciting in my opinion.
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