Dune

One of the finest world buildings I have ever seen. Saw the slow and systematic building of the world's ecology, culture, religion, and politics.
Best bit? Herbert did not spoon feed. At moments I forgot I was reading a work of fiction, where elements of mysticism become placeholders; metaphors for something bigger.

One of those kinds of books I would like my children to read. Definitely will be coming back to the world of Dune.