It is a colonial period missile silo
Although it is hard to find in history books, New England farmers were quite inventive. This was a precursor to the Nike missile sites that surrounded major cities in the late 50's. It probably was for the defence of Laconia and was erected when it appeared that we would be at war with England in the early 1800's. You dump several barrels of gunpowder down the stack and then pick up all the boulders that farmers would donate and place them on top of the powder and ignite!
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