There is some pretty strong evidence if you know where to look, The Dolman at North Salem Westchester County New York, a massive 90-ton stone shaped like a turtles head supported clear of the ground by 4 to 6 standing stones. Described officially as glacial erratics, some very clever glacier.
The Eye Chamber near Carmel Putman County New York, described as a colonial root cellar. Yet lined up with winter sunrise on December 22.