That little more being a load of concept work for the game. Locations, creatures, and characters can be see though out the list below. But there are three in there that should and shouldn't stand out to you. The in game views of each societies headquarters is down there for your gawking pleasure. Try to figure out which is which. For being secret, they sure do slap their emblem all over the HQ. That should help you figure it out now. Hells I'll even throw in the emblems with name to help you there.

I wish there were more details to give you, but for now, we just have to ogle these for out dark fixes.