•Why it earns a slot
Why it earns a slot: it's one of the first and cleanest examples of a story that spends 90 percent of its length inside a character's dying imagination without ever flagging it, an unreliable-narrator trick later writers spent decades reinventing.
A Confederate sympathizer is about to be hanged from a railroad bridge, and the rope breaks. What happens next isn't what it seems.
This distillation is written from the freely available original, which is always the better read when you have the time: Project Gutenberg.