I think it can be nearly anywhere, as long as there is a hunting justification. If you are hunting a wizard and he is crossing over, you should be able to pay a fate point and follow him, since you are crossing over in his tracks.
Other than that, anything that has to do with hunting, really. I like the idea of hunting stores. Hunting lodges could work as well. Or outlooks (those wooden towers in the forest). I've seen fences in forests and doors in them for the rangers and hunters to get through, those could work as a gateway as well.