https://listsofjohn.com/peak/183563
Is this a little inside joke I'm not aware of?

But it's no surprise people are not seeing anything, because the two "stations" (the little triangles shown on the map) are simply drill holes in the rock. Apparently there used to be cairns and a pole or board marking each one. But that was documented in 1894!
For some reason, I can't link the datasheet for T 60, which is the one that has details about this site. But you can look it up at the following link using PID HR2574 https://geodesy.noaa.gov/cgi-bin/ds_pid.prl