Ideal Dragon has, in his own words, “finally [redacted] finished” the Tenebrae city walls in his Exult-based remake of Ultima 8. And the results are truly impressive:

As you can see from the screenshots, it is possible to walk on top of the walls, and also through their interior hallways…something I don’t recall being a feature in Ultima 8. The level of detail Ideal Dragon has achieved is truly impressive, and it sounds like it was an excruciating amount of work to get everything right.