I've never been to the museum and much sadness now falls upon me because of it !!
I have been to the area several times and have only visited the circles/stones/cairns of the area. I hadn't used to be that interested in the petroglyphs and actually didn't know there were so many in that area .... shit, when will I learn to look at guide books!!??
I will be back though .. it may take a couple of years for me to get around to it, but I will be back there ... oh yes!