Here is a website dedicated to short stories
http://www.americanliterature.com/short-storiesMy first exposure to Arthur C. Clarke was a short story published in Playboy magazine. Well, Wikipedia calls
A Meeting with Medusa a novella. I don't recall it being particularly long enough to call it a novella, yet it won the 1972 Nubula Award for the Best Novella.
I recently read a short story by Chester Burton Brown called
Felix and the Frontier. I downloaded it when Amazon had it as a freebie for a short while. Unfortunately it is no longer free unless you can participate in their Lending Library. Amazon's description: "Felix is a sentient robot explorer, mapping the distant fringes of the galaxy ahead of a wave of pioneers. He has been programmed to discover complex life, and to introduce himself on behalf of his human masters." I found it captivating. Does 90 page make this a novella too? I can't find where the cut off is between short story and novella.
A month or so ago, I finally got around to reading
An Occurrence at Owl Creek Bridge. I also vaguely remember the Twilight Zone episode version.
I grew up with Mark Twain, Washington Irving, Edgar Allen Poe, and Conan Doyle's Sherlock Holmes short stories.