Second-floor outlet indicates voltage with meter but it does not power a lightbulb. We have repeatedly turned off every circuit breaker in the house and none of them has resulted in the voltage going away.
We believe that this is the only outlet remaining on an old 1920s era circuit but that is based on a previous attempt to identify which circuit it was and now we can't get the voltage to stop.
Where do we go next to comfortably get rid of this thing?
Unfortunately I don't have a meter, just a pen indicator. I assume that it is some sort of phantom voltage as mentioned in comments but if it were, it should go away when we turn off whatever close-by circuit is causing it, right? Yet it never goes away.
Based on some comments, I borrowed a meter from a neighbor and it shows not more than 1 volt. I will try shutting down the whole breaker and testing it then. And then I will disconnect (rather than just turn off) the circuit that I think it's on and see if that takes care of it.