Hi Asher,
It is something I came across last night, and which triggers me to go back there and shoot with a longer tele in portrait, then stitch to get the same frame like you see here, and of course, walk up there and do some other closer shots as well.
What is difficult to see here in this extreme crop is the multitude of old stone walls, on the right there is a round stone structure, remainders of walls hundreds of years old in abundance.
Yes it was fog that creeped up from behind the Hills in high speed, in less than 60 seconds later it was 100% invisible.
It was a shot from february last year, so I might be lucky and get a similar setup again soon. I like it so much that I really want to explore this scene for a large print.