Originally posted by UncleVanya Here it isn't uncommon in rural parts to walk through the woods and find an old barbed wire and post fence with no clear difference on either side anymore. Fences are funny when they stop being maintained and lose their purpose.
Decades ago we visited what is called The Harvard Forest, which is both a conservation area and especially a reasonably natural, wild woodland where research can be done. There were posters that summarized work done in or in the vicinity of the forest. One of them had surveyed stone fences, which can be found almost anywhere you into the New England woods (thanks to glacial till). Within the region surveyed, three of maybe four townships, the volume of rock moved to build the walls exceeded the volume of the Great Pyramid. Enough people doing small things adds up to something impressive, the ant-&-termite method.