I have two branches, both in player-towns. The larger one, focused on the Virtues and the history of Britannia from the Ultima series, is in Guardians Gate. To be more specific, take the east road out of Britain until you get near the swamp. After you pass through a small border fence, find the small clearing to the left. It will be the second house in the clearing. It is easy to find with radar because there is a giant ankh on the roof.
The smaller, where I would place it were you nice enough to give me one

, is in PaxOku. It is focused more on the enemies of Virtue, but also about shard history. Take a moongate to Homare-Jima in the Tokuno Islands. Head east to the road and then follow the road northeast toward the tsuki wolves. It is on the west side of the road, next to the Blue Light Tavern.
I would love to show you around if you are interested.