Lock 27 and Lockhouse (before NPS fixed it). A more recent photo of the same lockhouse appears here: <a href="//commons.wikimedia.org/wiki/File:C%26O_Canal_-_lock_house_at_lock_27_-_Spinks_Ferry.jpg" class="image"><img alt="C&amp;O Canal - lock house at lock 27 - Spinks Ferry.jpg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/9/9d/C%26O_Canal_-_lock_house_at_lock_27_-_Spinks_Ferry.jpg/100px-C%26O_Canal_-_lock_house_at_lock_27_-_Spinks_Ferry.jpg" decoding="async" width="100" height="61" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/9/9d/C%26O_Canal_-_lock_house_at_lock_27_-_Spinks_Ferry.jpg/150px-C%26O_Canal_-_lock_house_at_lock_27_-_Spinks_Ferry.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/9/9d/C%26O_Canal_-_lock_house_at_lock_27_-_Spinks_Ferry.jpg/200px-C%26O_Canal_-_lock_house_at_lock_27_-_Spinks_Ferry.jpg 2x" data-file-width="3016" data-file-height="1830"></a>
Historic American Buildings Survey
This image  is available from the United States <a href="//commons.wikimedia.org/wiki/Library_of_Congress" title="Library of Congress">Library of Congress</a>'s <a rel="nofollow" class="external text" href="//www.loc.gov/rr/print/">Prints and Photographs division</a><br> under the digital ID <a rel="nofollow" class="external text" href="http://hdl.loc.gov/loc.pnp/hhh.md0755">hhh.md0755</a>.<br><small>This tag does not indicate the copyright status of the attached work. <span style="white-space:nowrap">A normal <a href="//commons.wikimedia.org/wiki/Special:MyLanguage/Commons:Copyright_tags" title="Special:MyLanguage/Commons:Copyright tags">copyright tag</a> is still required.</span> <span style="white-space:nowrap">See <a href="//commons.wikimedia.org/wiki/Special:MyLanguage/Commons:Licensing" title="Special:MyLanguage/Commons:Licensing">Commons:Licensing</a>.</span></small>