The City Library has parking. Also, street parking is free and open to all on Sundays.
The Harvard University parking garage system has room for visitors to park in the 52 Oxford Street garage, just a short walk from the museums. Please see details on making a reservation here: https://hmnh.harvard.edu/directions-and-parking.
On Sunday, the parking is free
There is none. If you are lucky, you might find one on the street.
it's just outside of the square so basically APPALLING.
Thanks! Your answer is awaiting moderation.