During the episode Skeletor manages to destroy the Mystic Wall and we don't really see it afterwards.
Which is why I find this panoramic-view of both halves and ruins of the Mystic Wall in the middle terrific. It is a great image that shows the scope for the Mystic Wall that should have been featured more in the series.
With Masters of the Universe comic Volume 1, Issue 2 we see He-Man embark on a journey to the Dark Hemisphere and Man-At-Arms and Orko travel with him up until the ruins. Once again the ruins look really interesting and it is a shame it was not visited again in the comic either.