The Trial by Kafka. Holy shit that thing is dense and only somewhat not boring.
Memory Keeper's Daughter. Hate it. Stupid 1960's drama crap. I don't even care. Got through half of it before I realized how stupid it is.
More than a few old sci-fi novels that sci-fi nerds recommended to me. Mainly by Philip K. Dick, Isaac Asimov, Robert Heinlein, and a few other who write like that. I can't stand the boring style they write in.
Red, Green, Blue Mars by Kim Robinson. Eon by Greg Bear. Just really long. Probably will get around to it eventually.