It's just a street in downtown Boston. There are many old buildings on both sides of the street, such as an old building at MIT. Traffic is relatively less busy, Boston Marathon.
The Boston Marathon bombing took place in this street. The street is relatively wide, with six lanes, but it is not the main road. The traffic is not very busy, so it is suitable for running marathons. The roadside buildings are relatively old, and one of them is the earliest MIT campus.