What is this on my wall?

So the house that I live in was built in the early 1920s and its definitely a constant project. It has no structural tell tale signs but it's always had since I've lived here (5 years roughly) this large bump in the wall that leads into the unfinished basement. On the other side of that wall is the outside and a small wooden shed. It's not lower leveled enough to be underground yet. I broke a piece off just to show you all whats behind the wall so maybe I could get some advice on who to call it fix this.

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submitted by /u/april_showersxo

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