Leviathan

Economics: - The Wealth of Nations, Adam Smith - Das Kapital, Karl Marx - That Which Is Seen, and That Which Is Not Seen, Frederic Bastiat Philosophy / Politics: - The Republic, Plato - Second Treatise on Government, John Locke - The Law, Frederic Bastiat - Leviathan, Thomas Hobbes - Meditations, Marcus Aurelius - Democracy in America, Alexis de Toqueville - On Liberty, John Stuart Mill Fiction: - The Celebrated Jumping Frog of Calaveras County, Mark Twain - The Story of an Hour, Kate Chopin - Metamorphoses, Franz Kafka - Candide, Voltaire - The Count of Monte Cristo, Alexandre Dumas

Most of the "eye-opening or incredibly interesting" philosophical material that I've read has been in individual articles rather than books. That said, here are a few favourites from various areas. It's a bit heavily weighted towards recent material; Kant and Plato ought to be on there, but I can't stand Kant as a writer, even if his ideas are profound, and Plato's style has always irritated me for some reason I can't quite put my finger on. I could probably keep tying titles all day, so I'll stop with those that first popped into my head. Aristotle, Nicomachean Ethics David Chalmers, The Conscious Mind: In Search of a Fundamental Theory Gottlob Frege, Die Grundlagen der Arithmetik Thomas Hobbes, Leviathan David Hume, An Enquiry Concerning Human Understanding J.S. Mill, On Liberty John Rawls, A Theory of Justice Stewart Shapiro, Philosophy of Mathematics: Structure and Ontology