Interesting how many fall into some category of "horror" or have a creepy dark twist. I suppose the length and PD requirement pushes for that... the nothing-really-happens short story may be entertaining but is forgettable, while scary or intriguing lasts longer in our minds.
Science fiction in the public domain is a much smaller pool of stories, and a lot of them are either mysteries with a technological twist or "shocking revelations" that fail to be shocking to modern readers.
For myself, I'd pick out one or more (probably one, given the collection) stories by Saki; I'm fond of The Lull, The Story-Teller, and Sredni Vashtar.
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