So I just found this image from Iron Bound Throne and I have to say that it gives me all sorts of amazing and awesome ideas. The fact that its so completely circular to me indicates some high level geometry, maybe even one based on spells. The fact that its in the middle of the woods indicates to me that the place is in either some new lands or is hidden from the prying eyes of mundanes.
I also cannot help but think that this might be a perfect example of an even more potent and powerful Conjuring the Mystic Tower, probably called Conjuring the Mystic City, hehe. If you consider there to be paths between the buildings in each circular area than a single spell could connect them all. It would be an epic undertaking but I think it could potentially be awesome for either at the middle, end, or even beginning of a saga. I could see it be the end result of hours and days of gameplay, of characters rresearching and adventuring to gather the material. I could also see it be at the very start, with the elder master of the PCs casting the ritual, establishing the base, and then sacrificing himself willingly to empower it and become the spirit of the city. I could see the city being in the middle of a wilderness tucked in a regio so that mundanes can't see it, or in a wood covered valley surrounded by mountains, or somewhere else.
Anyway, I wanted to share the image cause it really called to me. And I think anything that causes a creative person to be like "oh my lord that is awesome" should be shared to others for maybe discussion and conversation.
As a final note some questions. What sort of size do you think the city might be. I'm thinking maybe something like a mile around, basically the equivalent of old London central, but I don't know. I would probably make everything stone, with a Muto Herbam requirement that makes them regrow on their own. I could even see that what looks like the statue in the center being the focal nexus point for the ritual spells and bindings that surround the city.
Anyway, I think it was fun to share and I hope that maybe others might find it discussion worthy.
PS. I do not in anyway claim creative power over the picture, I tried to find its origional source but all I could find was a relink of a relink of something else, so no actual original.