Green Line vent structure west of Massachusetts Avenue, seen in July 2021. At left is construction on the Parcel 12 property over the Massachusetts Turnpike. At right is Newbury Street and the Mass Pike on-ramp - the latter realigned as part of construction.
<a href="//commons.wikimedia.org/wiki/User:Pi.1415926535" title="User:Pi.1415926535">Pi.1415926535</a>
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<span class="int-own-work" lang="en">Own work</span>