A thought that crossed my mind, when imagining going to and from cities as one adventures around, gathers resources, what have you, is unique single areas or buildings for a town to have, requiring perhaps special/exotic resources for some, or simply more contributors of a certain type. I'll make a list for some that come to mind:
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Mage's Guild/College - Either several different ones specialized on the training/knowledge distribution gathered by townsfolk, or one big one that simple stores magic-related knowledge. The same idea would apply to A Warrior's Training Camp, or Bard's College. Since Bards are confirmed in game.
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Town Square - This one is far from exotic, really, a wide open, even custom sized area of brick, cobblestone, dirt, or marble, for multiple purposes. A bazaar/market, or perhaps a place where the local bard could do some sort of idle play, (bonus if we can eventually upload midi or abc files to play custom songs,) creating a bonus or two for nearby resting characters.
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Churches to a Respective Deity - This one was rather obvious, given the part divines play in the game's concepts. Could be decided upon by the guild/governor, or perhaps whomever is assigned to managing the building. Whether or not buildings beyond a player's home will be assignable, I don't know. (Nor is is overly important.)
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Specific Resource Processing Buildings - From smelting factories, to Grain Mills, to Saw Mills, manufacturing resources as a group could put a town on a map. A riverside town could work on fishing, a forest town could, obviously, deal in logging and reforesting, and a town near a mountain might have access to a mine, potentially to the point of finding major metal veins, having stone production, or even discovering a dungeon deep within. These buildings would heavily depend on the town's access to resources.
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Network/Trade Hubs- This one weighs upon the last, a set of stables, Log Driving stations, Wagons, Food Salting/Barreling facilities, ways to transport a city's excess output to other towns. Creating trade routes, run by NPCS, to create commerce and growth. Routes that could be attacked, or at least extorted, by the more criminal element, or even blocked by a warring force. That's all beyond this topic though, the buildings are the focus for now.
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Portals - This one I expect already, likely has already been established, (Or established to not be a feature,) I just forgot. An obvious potential feature, for likely larger cities, allowing for the easier, instantaneous travel between different regions of the planet. For a fee, potentially.
Alright, that's what I've got from the top of my head. If anyone else has some comments, ideas to pitch in, or ones to confirm/dispute, I welcome it all!