<p>Chicago in 1856 - 2nd fort Dearborn
</p><p>Public domain 
</p>
<a rel="nofollow" class="external free" href="https://www.reddit.com/r/chicago/comments/52i4wj/downtown_chicago_in_1856_second_fort_dearborn/?st=IT1L4GSA&amp;sh=719c57e4">https://www.reddit.com/r/chicago/comments/52i4wj/downtown_chicago_in_1856_second_fort_dearborn/?st=IT1L4GSA&amp;sh=719c57e4</a>
<a href="//commons.wikimedia.org/wiki/User:Victorgrigas" title="User:Victorgrigas">victorgrigas</a>
<span class="int-own-work" lang="en">Own work</span>