I mostly read Fantasy books, there are a few exceptions on this list, but mostly they're fantasies.
The Dark Tower Series - Stephen King
I haven't finished reading it myself yet but just read it. It's amazing. It's about Roland, the last gunslinger searching for this tower in a world that has moved on and emptied. It sounds shit when I put it that way. But it's amazing; especially if you tend to find most people's characters uninteresting.
NarniaParticuarly Prince Caspian and The Silver Chair. I read 'em when I was a youngling and they are still the best books ever.
Magician - Feist
It's long. It gets boring at one point in the middle, but the books that come after it are just amazing. Particarly Silverthorn, A Darkness at Sethanon, Jimmy The Hand and The Krondor books.
The Demonata Series -Darren Shan
Yet again not the best books in the world but the story is pretty immense and a few of the characters are kind of legendary.
The Cirque Du Freak Series -Darren Shan
Shan's btter series, about Vampires. Yet again, not the best books ever but they are worth reading.
The Wind On Fire Trilogy- William Nicholsan
Probably one of the most beautiful things I've ever read. I can't say much about it without ruining it though.
The Noble Warriors Trilogy- William Nicholsan
Not as good as The Wind On Fire but it's still alright. A tad predictable with one of the most strangest events ever in it. It's about Seeker, Morning Star and Wildman who are all rejected to be Nomana [fighting monks] who go on an adventure.
Also...
His Dark Materials -Pullman
The Magician Guild -Trudi Canavan
Saving Charlie The authours name has slipped my mind