Recommend natural/off-grid/passive/etc. (or just plain cool) buildings to visit in Boston?

The plan is I'll be visiting Boston next spring, and while I'm there I will have some time to go look at stuff. I'm not very interested in the typical Boston tourist stuff, but I figure it's a town full of smart people, maybe some of them have built cool permie-adjacent structures I can go visit. Or just any cool architecture really, if it will expand my mind a bit.

Can anyone here make recommendations?

If I were headed there I would visit for the peace and serenity of the Labyrinths:

https://www.armenianheritagepark.org/photos

https://www.bc.edu/bc-web/sites/memorial-labyrinth.html

Some possibilities that might be interesting:

Eastie farm Urban farm with geothermal greenhouse.

Some rather ugly net zero and passivhaus buildings.

Looks like they've done a lot of work in the city since this study by MIT mapping the energy use:

simulated energy use for the city of Boston

Some other municipal suggestions listed here

Maybe the people at the urban farm might have some good suggestions.