Has this been discussed here already?
http://www.hvmag.com/Hudson-Valley-M...story-Mystery/This rock cavern offers local travelers a curious sight: so carefully crafted, it seems out of place sitting along the shoulder of a major roadway. Perhaps even more curious is the fact that there are more than 100 other rock formations, mirror images of this one, sprinkled throughout this heavily populated mid-Valley county.
Their dimensions are remarkably similar: each cavern is approximately 10 feet high and 15 feet wide, with an arched wall of granite slabs. Usually topped with boulders, moss, and logs, the structures were constructed so exactingly that no adhesive was necessary.
But the pivotal information about these caverns — when were they built, by whom, and why — remains unknown.
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