I'm pretty sure that the Assassin HQ in the far north of the map contains a "fast travel" location, and that it also has a place where you can dispatch your assassins on missions, but heck if I can find either of those things actually inside the base.
It seems like it's a simple building, but I'm constantly getting lost. Is there a map somewhere of the assassin HQ, listing the various spots you can interact with?
Best Answer
I don't see how anyone should really need it, but since you asked I drew a sketch. There are some places in the hideout where you can interact with only once (after reaching a certain point in the game), I don't recall where all these locations are exactly but they are of little/no importance so I've left them out.
Not to exact scale but close enough for illustrative purposes showing all the different interactive items in the hideout: