This page is part of the webpage on the history of Lord's Point, at http://qb.mindhenge.org/LordsPoint.html, which in turn is part of the history of the Quiambaug Valley, at http://qb.mindhenge.org/; the author of these is Bryan Bentz.
The stone wall height actually has changed slightly - if you look at the stones at the right edge of the picture, you can see the identical ones morph into color, unchanged.