Exterior of Chamber (Entrance area rebuilt by owner.)
This is on private property so I cannot say where it is other than in the southern part of New York. The owner does not appreciate trespassers.
This sits in his backyard. The front part of the structure has been repaired by the owner but the interior is original. The exterior is deceiving. It is quite large on the inside. There is no evidence it has ever had a door.
Entrance – Interior tall enough for a person to stand.
Interior rear corners corbel inward at the top.
Right rear corner also corbels inward.
Upper left rear corner corbelled inward.
Roof stones.
Tool marks? Graffiti? Or a message?
Wider view of marks.
Ceiling and upper walls made of massive stones.
Looking towards the exit. Sunlight enters through the stones.
Is it a time portal? Root cellar? Ice house? Ancient Meditation chamber? Well…. This one sits remarkably close to a very old house in an area where there seems to be a chamber at every old house. Was a stone chamber found by the colonists and they thought it was such a great idea they all had one installed? Time may someday tell.
Someone suggested they might have been for brewing and storing beer. This would explain why they don’t appear on home inventories from the colonial period forward. !!
noahsage 
Amazingly European style,similar to passage tombs in europe..wonder how much was changed during owners reconstruction,or if its near original…is its the latter,its a dead ringer for passage graves in Ireland scotland,portugal,spain and Brittany area france…
Having been in it and spoken to the owner, the exterior entrance was rebuilt and the interior is original. Their resemblance to European chambers is why they were assumed to be of colonial origin. There is still no definitive answer as to who built them and when. But it would appear mother nature is adept at destroying them so they cannot be all that ancient, unless the Indians maintained them over the years. Hence, the mystery.
I believe these are ancient sites throughout new England,2000bc-600ad by various pre-celtic people,viking and phonician explorers/settlers…some are root cellars but most are not plain and simple…and walls in Putnam co and other areas have ceremonial feel…
This is very possibly all true.