"By the Waters of Babylon" is a post-apocalyptic short story by American writer Stephen Vincent Benét. It takes place in the territory of the USA and New York City.
The narrator of the story is a young man who explores the world around him. People live in tribes and they do for a living what ancient people did in the distant past (hunting, gathering plants, etc.). The main character also sees the signs of the apocalypse that mankind will face in the future.
This mixture of past and future is what differentiates the story from others and makes it memorable.
This is a link to the text of the story:
https://notamanuscrita.files.wordpress.com/2015/07/benet-babylon.pdf