A review by lukesullivan013
The Three Theban Plays: Antigone; Oedipus the King; Oedipus at Colonus by Sophocles

Same with The Iliad, I don't really know what I could possibly add to multiple millennia of discourse, but there's a reason that these are THE tragedies. Incredible in their own right, as well as observing and criticizing the culture they come from.