From a blog called: In the Field

Sunday, October 25, 2009 ~ Quinnipiac Trail: Journey's End
http://sheltontrails.blogspot.com/2009/10/quinnipiac-trail-journeys-end.html

“The first part of the hike was in Naugatuck State Forest, Sanford Block, and included the highest point along the Quinnipiac Trail: Mt. Sanford at elevation 890 ft...Near the true summit I found one large pile of rocks and many smaller piles of rocks at intervals that made me suspect this might be a Native American ceremonial site. No view there, but when the trees were cut you would have been able to see for miles to the east and west.”
A Rock Pile search of the blog reveals a photo taken in Rhode Island:

http://sheltontrails.blogspot.com/2010/09/arcadia-forest-rhode-island.html
Searching 'stone' I found: "Here's perhaps the most unusual stone wall I've ever come across in the Grace Richardson Conservation Area. The weird wall/cairn/sculpture was a good six feet tall or so. It begs the question: Why?"

http://sheltontrails.blogspot.com/2010/05/random-fairfield-parks.html

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIP1ZNzlQMJkb6YQHtAeRPgr6pnrX7RmpufPv4bzqY6AbX1FQn0BpJf5ry32GiaFUUjstZAi9nPqew_jOx2fdXfR_Q0wkmlRNhbmgulFbALtqHItycMzUHD7TwSb7_RCY_fnR6/s1600/IMG_2694.JPG
The blog: http://sheltontrails.blogspot.com/
From the author's Flick Fotos, a Danbury CT find:

https://picasaweb.google.com/100939962699760019806/SheltonTrailPictures#5340597347954299506