Joseph Mitchell's trestle bridge, Fort  Augustus.
<a rel="nofollow" class="external text" href="https://www.geograph.org.uk/profile/26184">Colin Wilson</a>
CC BY-SA 2.0
From <a rel="nofollow" class="external text" href="https://www.geograph.org.uk/photo/1885826">geograph.org.uk</a>