The fog is indeed perfect for this - makes it seem as though it's either emerging from a time past or being sucked back into time. Lovely rich cool colors.
The fog in this photo really helps set the mood. it gives the feeling that something has been lost, which fits in with the old ruins.
Composition wise, it seems a little unfinished, like there is more to the scene. You are cropped close to the Chimney, and the right the wall is still going. I sense that you couldn't move further back though. Hey, its a side challenge, how about a panoramic of one of these buildings. Try and multishot and see how it goes, giving us the full building or area? Just a thought but I think it could work well (and won't get hurt bu the anti-pano people).
Looking forward to seeing more photos from here.