I noticed what looks like a man made structure above Ysgramor's tomb at 4.11. It's not listed on the map and I can't find any reference to this. Could this be a part of some future DLC?

If you want to find it, position yourself near the water line. Make sure that when you look to the right you see the Tomb and when you look to the left you see the Shrine of Talos. Just look on top of the mountain about halfway up and you will see the structure. I wish I could upload a picture to this forum so you could see what I'm talking about.