There are hundreds of stone chambers in the woods of New England and New York. I made this video to cover some of the theories behind their presence.
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Further reading/references:
https://www.onlyinyourstate.com/connecticut/hermit-cave-ct/
http://www.strange-new-england.com/2015/10/22/upton-chamber/#more-429
http://www.strange-new-england.com/2017/04/09/hermit-cave/
https://www.uptonma.gov/historical-commission/pages/heritage-park
https://www.ancientpages.com/2017/10/10/ancient-mystery-upton-chamber-cave-massachusetts-one-largest-ancient-man-made-structures-new-england/
https://www.sciencedirect.com/science/article/abs/pii/S1871101415300303
https://www.showcaves.com/english/usa/subterranea/Upton.html
https://www.milforddailynews.com/article/20120714/News/307149974
https://stonewings.wordpress.com/2012/03/14/the-hermit-cave-hot-house-cold-house-or-something-in-between/
https://thestonetrust.org/master-class-masterclass-theory-of-corbelling/
https://www.richardcassaro.com/new-englands-mysterious-megalithic-stone-chambers-usa/
https://northernwoodlands.org/articles/article/stone-chambers
http://archive.boston.com/news/local/massachusetts/articles/2012/07/12/mysterious_cave_now_part_of_new_upton_heritage_park/?page2
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