Top classic novels and nonfiction

Recently I’ve developed a strange desire to read some of the classic novels in literature and nonfiction. As the majority of Americans tend to only read through these while in high school or university, I believe we’ve missed out on so many great books. I have a number of classics on my shelf at home, but with my limited time to devote towards reading, need to be selective.

So my question for you is, what would you consider to be your top five favorite classics?

These can be works of fiction or non-fiction. I know there are lots of lists out there by the BBC, Guardian, etc, but I’d like to hear your own opinions. What are the works which have altered your perceptions?