Requirements for Hall of Unity?

The requirement for Hall of Unity says "You must control at least 3 worlds". That's ambiguous. 

I suppose World = Core world. Is that correct?

I have 4 core worlds (my own, not conquered) and none of them have the Hall of Unity in the build list. Does control mean conquer? Do I need to conquer three (core?) worlds to be able to build the Hall of Unity?

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The Hall of Unity popped up in the game today, after playing a while. No planets conquered, so that's not a prerequisite. But it didn't appear on all my core worlds, so there seems to be a hidden / undocumented prerequisite. Or a bug where some buildings in the available build lidt appear and disappear. I wanted to build it on a specific planet, and destroyed another building to make room. That made it disappear from the build list. I scrolled around a bit between planets and other stuff and popped up the planet again, and now it was back. 

Ah well, I guess bugs are to be expected.