One last piece for the day and this is by far the biggest stretch of them all. Sancre Tor was once a powerful fortress/city of the Reman era in Cyrodiil. In Oblivion it was just a slightly larger ruin. We have the ability to make it something more spectacular especially since the Colovian Highlands lack a major city. The plan is to connect Sancre Tor to the barrow region that will be in the CH sort of like and anchor point to the desolate and ghostly landscape. What better way to do so than to do Sancre Tor justice as a ghostly ruined city? Here is an image I though evoked the right feeling and even has some of the classical elements we use in our Cyrodiils architecture showing how one style could have followed the other.
http://www.deviantart.com/art/Keldon-Megolith-70040250