Looking into the eastbound Green Line tunnel at North Station from the end of the outbound (upper level) platform in April 2021
<a href="//commons.wikimedia.org/wiki/User:Nick_Boppel" class="mw-redirect" title="User:Nick Boppel">Nick Boppel</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>