One of my favorite things to look for when traveling are geological survey markers. Survey markers are objects placed to mark key survey points on the surface of the Earth.
I get a thrill seeing one on a remote mountain top, imagining the survey crew who hiked in there and placed it.
Here are some pictures I’ve collected along the way:
Pine Mountain, Georgia (note the triangle indicating this mark is used for triangulation)
El Malpais National Monument, New Mexico
Charleston, South Carolina
Cadillac Mountain, Maine