Ultima Forever: Vesper
The town of Vesper is inaccessible in the release version of Ultima Forever. Not that it isn’t present in the game; it’s located to the south-east of the Shrine of Sacrifice, but it can’t be accessed by land. Mountains, forests, and even a moongate stand in your way if you try to access it. (I think, assuming Ultima Forever‘s boating system had been preserved, Vesper was supposed to be accessible by sea only.)
After the shutdown of Ultima Forever’s online services was announced, I took one last stab at extracting the game’s data files — which are encapsulated using Mythic’s proprietary MYP archive format — using EasyMYP. There was nothing to be gained from the MYP files in the iOS version of the game; these use a newer version of the encoding that EasyMYP can’t process. However, one of the MYP files for PC alpha version of the game could be opened using the tool…and inside it, I found the map of Vesper.
Exactly what events in the plot of Ultima Forever would have transpired in Vesper remains unknown.
I remember seeing Vesper in the Alpha. I didn’t take too many notes, but one NPC therein did talk about Blackthorn’s regency. Wonder why they didn’t include it in the final game…