Walk in Boston # 4: sculpture, art and architecture at MIT
A two hours walks on the MIT campus then along the river with views of Boston.
Walk in Boston # 16: from Symphony to Brigham Circle
A 2 hours walk (except if you stop at the two largest art museums of the city) through the campus of 5 universities and their galleries.
Walk in Boston # 17: from Longwood to West Fenway
2 hours to explore a part of Boston off the beaten path.
Walk in Boston # 18: venerable Harvard
A 1h30 to 5h walk (or more depending on what you choose to do) to visit the Harvard campus and its surroundings.