This is one of the US Geologic Survey Markers. These have been placed all over the country in places of interest. You can find them at the tops of mountains, the shores of rivers, and at any number of border markers.
This one was affixed the the aquaduct featured last week on the C&O canal.
You can order maps with the marker sites straight from the geologic survey. However, you have to pay for them.
Don’t get these confused with the National Geodetic Survey markers, as seen here. Those are put together by an entirely different agency. Though it is noteworthy that in the location pictured in the link above, there is a Geologic survey marker right next to the boundary stone that has the geodetic survey marker on it.
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