In the mid 1980s US 59 was widened.
A few miles north of Queen City, Texas one of the few remaining original Headright Boundary still intact with cut stone monuments and witness trees at each end with many original trees along the entire boundary were labeled "DO NOT DISTURB & KEEP AS NATURAL" on the plans of the Federal Funded project.
It would have been in the center median of the completed project.
However, all was completely destroyed.
Some of the DOT personnel disappeared during and after the project was completed.
My story is very minor compared to these. Did a simple one lot survey. Less than 30 days later I had another job in the same block. Three out of four of the bars set less than 30 days earlier were easily found. Where the heck is number four? Then I saw the new gas service line running to the house. The trench was only four inches wide but must have been centered directly through the bar. Never did find the bar. The probably saw the flag and decided it was an indicator of where to run the line.