Random Ruins generator?


I'm relatively new to posting, so forgive me if this has been asked before, but my quick search has not yielded answers.
Is there, or has there ever been a mod that adds additional generated structures or dungeons/ruins or something of the sort? I'm thinking something along the lines of Minecraft's "Ruins" mod.

If not, is it because there is a technical limitation involved? Or is it just not something that most players would like to see?
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