Probably Bigfoot. Or not. Welcoming anyways.
Here’s some evidence Bigfoot may like Hot Wheels. They’ve maybe screwed this bit o’ track to the floor of a “covered bridge” located not far from the first photo of this post above. Probably not again, but just saying, just showing. And the arranged rocks once more…
I wonder if they swing on this swing when they know no one is around, play with the rocks, bring their Hot Wheels and more track stored safely out of the elements in their nearby dwelling places to attach to this base stretch. Could be Bigfoot children taking a break from the serious lives of their parents and elders. Just make sure a human doesn’t see you, they might warn. Or they could be out on a lark. Bad Bigfoot children! if so. Elders always know best when it comes to safety.
We cannot speak of Area 54 and its mysterious rocks and pipes (etc.) in any detail which would provide you the reader further information for the weighing of truths in this matter. Maybe later, sorry.