Does hero players know about unique spaces?

By zKermaperuna, in Descent: Journeys in the Dark

Hello

Should hero players know about the unique spaces and where those are?

Specially in encounter 2 of Rise of Urthko from the campaign Heirs of blood I have this problem.

So should they know already in the beginning that there are those spaces and where to find them, or should they get to know about those later when overlord uses them?

Yes, heroes do know about unique spaces.

My group frequently marks them with unused objective tokens.

It’s work pointing out that no information (except for the OL’s hand) is hidden unless a quest says so.

Ok

Thank you