“Dear PoPville,
I’ve been googling and googling and can’t find it: What is this cement marker, which is along the Reservation 630 trail in Rock Creek Park near Picnic Area 2 at Pierce Mill?
(Looking at the picture, there appears to be a little knob or disk of some sort on top, but when I was there I didn’t really even notice it, so I don’t think it’s an inscribed metal survey marker or anything particularly helpful, at least to the untrained eye.)
I’m including the original photo and one I edited to enhance the engraving a bit.”