Built to export slate from the Penrhyn Quarry, the largest slate quarry in the world at the end of the nineteenth century
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/16801915@N06">Reading Tom</a> from Reading, UK
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/16801915@N06/35388295195/">Porth Penrhyn</a>