The three classic pieces of Chinese Literature.
I think that 三国演义 does have a bit of actual history in it, though it might not be completely factual.
I've read parts of 西游记 as well, not all of it. And I heard that monk in the story was based on a real person.
I don't know much about 红楼梦 but I can always go to my grandfather's library in Singapore and read it there.