[Norman Muller writes about this post]
I saw the video clip you posted of "Mysterious Rock Structures in Great Smoky Mts. NP" and the circular structure posted reminded me of a photo of a similar structure I had saved on my computer, which was presumably found in Cades Cove in TN. (see attached). Larry Harrop photographed a similar feature somewhere in RI (see second image below).
[Now, Peter writes]
A rock pile with a central stone is a common design. I personally think the central rock was probably for casting a shadow, as suggested by the video author. I did a search of this blog for the word "fin", which gave these and several other examples:
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