I've updated the post with a comment on the barn above from regular Shedworking reader Bill Dockery who writes:
"This barn is only a couple of dozen miles from my home. It's in the Cades Cove region of the Great Smoky Mountains National Park and is maintained as a museum specimen by the NPS. The cantilever barn form is native to East Tennessee, and there remain dozens of these structures across the landscape of middle East East Tennessee. Some are a hundred years old or more. A friend of mine, the late Marian Moffett, published a major study on them."