Following your preferences:
Brave New World - Aldous Huxley
Slaughterhouse Five - Kurt Vonnegut
1984 - George Orwell
Animal Farm - George Orwell
Frankenstein - Mary Shelley
The Sirens of Titan - Kurt Vonnegut
Time Machine - H.G. Wells
The Invisible Man - H.G. Wells
Pretty much anything written by the authors above.
Lord of The Flies - William Golding
Anything ever written by Tolkien
Fahrenheit 451 - Ray Bradbury
The Martian Chronicles - Ray Bradbury
Not really in what you want, but you should still find them enjoyable:
Crime and Punishment - Fyodor Dostoevsky
Memoirs from the House of the Dead - Fyodor Dostoevsky
Edit!: I saw you already read War and Peace, good man, so I'll remove that
Try Dostoevsky's books if you liked War and Peace, read Crime and Punishment first.
Also try Anna Karenina, also by Tolstoy, great novel.