I don’t know how ‘obscure’ this is, but I read two great short story alternate histories in an anthology - ‘The West is Red’ and ‘The Forest of Time’. I loved the world building in both and would love more of it.

Bonus mention for a humorous one from the same anthology “How I Lost the Second World War and Helped Turn Back the German Invasion”

Here’s the anthology that has all three stories:

https://en.m.wikipedia.org/wiki/Roads_Not_Taken:_Tales_of_Alternate_History