The Moody Street Feeder Gatehouse, built in 1848.  Located on the north side of the intersection of Suffolk Street and Merrimack Street, on the west side of the canal.
<a href="//commons.wikimedia.org/wiki/User:Emw" title="User:Emw"> Emw</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>