Well, there used to be four. Dorchester Heights was deconstructed in part to fill in the Back Bay. https://en.wikipedia.org/wiki/Fortification_of_Dorchester_Hei

Well, there used to be four. Dorchester Heights was deconstructed in part to fill in the Back Bay. https://en.wikipedia.org/wiki/Fortification_of_Dorchester_Heights#Legacy https://en.wikipedia.org/wiki/Fortification_of_Dorchester_He...