I’ll chip in a few from the sci-fi/fantasy ranks.
And I’ll list a favorite novel or two from each.
J.R.R. Tolkien: [I]The Lord of the Rings[/I], [I]The Hobbit[/I]
Ursula K. LeGuin: [I]The Left Hand of Darkness[/I], [I]A Wizard of Earthsea[/I]
Connie Willis: [I]The Doomsday Book[/I]
Martha Wells: [I]The Death of the Neuromancer[/I], [I]City of Bones[/I]
Mervyn Peake: [I]Titus Groan [/I], [I]Gormenghast[/I]
These two novels are difficult to read, and I’ve known many who simply bounced off the dense writing, the flood of bizarre images and scenarios, but once read, they are not to be forgotten. NOT to everyone’s taste.