Well, at a glance:
-Lord of the Rings: Yeah, it's the obvious candidate, but if you're a lover of fantasy, read it. It's pretty much a requirement of the genre.
-The Wind on Fire: For the most part, I'm staying clear of reccomending children's books, even though I'd willingly sing their praises (Rowan of Rin, Deltora Quest, the Chronicles of Narnia, etc.). However, I feel this trilogy has as much worth reading as an adult, if not more so. While it has a playful, almost idiosyncratic method of writing, it's also, IMO, very poignent, and even philisophical at times (e.g. what is freedom? What is equality? What makes a fair society?). Not as deep as other works, but IMO, worth a read.
-Thursday Next: If you like Terry Pratchett, read this. Now.
-Mistborn: I've only read the first book so far, but I reccomend it. While the book has its dark, even graphic moments (e.g. graphic violence), and a fair share of polities, it's also very much an adventure story, complete with its own dark lord equivalent. Oh, and the setting/word-painting is quite interesting as well.
-Wheel of Time: I'm including this for the sake of consistency, in that I've read the first three books and...well, really don't like them I'm afraid. However, I'm mentioning them because they kind of sit between LotR and AsoIaF, in that we have LotR-esque tropes (dark lords, not-orcs, not-nazgul, etc.), but also a fair share of political intrigue (e.g. the various nations). Not my cup of tea, but something you might like.