In an ongoing project, we will be mapping and documenting the various walking and biking trails through Malden, MA
The 2017 DCR annual Park Serve Day on 4/29 was a great success - details here
The Friends of Fells provides more on this -"Uncovering the MIT Geodetic Observatory in the Middlesex Fells"
For additional environmentally friendly activities visit Mystic River Watershed Association
The "MIT Geodetic Observatory" is an 1899 historic site located within the borders of Malden, Massachusetts, in the Middlesex Fells Reservation.
You can read more about it in this 60-page document. Since we first wrote about this site, the DCR has now added trail signs making the location much easier to find.