This is a common problem i believe where great works can't be seen as if they never existed if you set up a city in a new region not connected to it. Is this intentional or were we meant to all along both see and use them from these far places?
No you won't, I can't find it right now, but there was a blog entry from one of the devs that said that getting more than one Great Work benefit to one city would be out of balance. Only reason to play a large region is to be able to chat with other players you can view on your map. Yay.