Is there something in your files that you have only looked at one or two times? Have you looked at the entire thing–including every minute detail?
Today I looked one more time at historical topographical maps on the United States Geologic Survey website and discovered a road on the map that I did not know existed and which suggested that at one point in time there may have been a house where I did not know one existed.
The historical topographic maps are available at https://livingatlas.arcgis.com/topoexplorer/index.html
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