Well, there's 'An Occurrence at Owl Creek Bridge' by Ambrose Bierce. This story has a very interesting plot structure that plays with the reader's perception of time. Additionally, Hemingway's 'Hills Like White Elephants' is famous. It's a short but powerful story that mainly consists of a conversation between a man and a woman at a train station, with much left unsaid but strongly implied about their relationship and a difficult decision they face.