Constructing the base of CN Tower, Toronto
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bobolink/">Robert Taylor (Bobolink)</a>, from Stirling, Canada
CC BY 2.0
Derivative of <a href="//commons.wikimedia.org/wiki/File:CN_Tower_footings_1973.jpg" title="File:CN Tower footings 1973.jpg">File:CN Tower footings 1973.jpg</a>