We had an event at a new-to-us park. Many courses crisscrossed long, low rock piles in white woods. One of our savvy members found the 1940s aerials and checked them, and sure enough the rock lines were field boundaries 80 years ago.
1940 (with the control locations):
which now looks like
Aerials, if you are curious, here
, use the "More" in the upper rightish area to check them out. If you toggle through the years, you can see the woods take over. (Crooked Lake northeast of 75 & 15)