What are some “Must Reads” in your opinion?

I'm not sure what the genre is that I'm thinking of, but it includes Fahrenheit 451, 1984, Brave New World, etc (Dystopian fiction?). I've been really into these "banned" books lately because they typically have deep knowledge and understanding of how the world works and how it could devolve in the future. If you have any suggestions of books like this, or really any book you love, I'll happily give them a go. Don't be afraid to include the classics that most readers know