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> Beyond the local galactic cluster though -- quite possibly nothing.

Do you mean the Local Group?

https://en.wikipedia.org/wiki/Local_Group

Or the Local Supercluster?

https://en.wikipedia.org/wiki/Virgo_Supercluster

The Local Group is gravitationally bound, but that isn't the case with the local supercluster. I believe that most (all?) superclusters are not gravitationally bound.

In fact, the entire local group will eventually be a single galaxy I believe, mostly composed of the contents of the Milky Way and Andromeda galaxies.

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