A ferry-hopping loop through fortified islands, a former dump turned park, and a 1716 lighthouse
Some of the best of Boston is not a building at all. Five stops over 40.6 miles, about an hour and a half of driving. Every stop narrates itself when you get there, at whatever pace you feel like walking.
It is one of 50 tours in Boston, each taking a different line through the city. Nothing is booked and nothing expires, so you can start it on a whim and finish it whenever you like.