<a href="//commons.wikimedia.org/wiki/New_Orleans" title="New Orleans">New Orleans</a> after <a href="//commons.wikimedia.org/wiki/Hurricane_Katrina" title="Hurricane Katrina">Hurricane Katrina</a>: 
<p>Mold sprouted from minor storm leaks in bedroom of an unflooded home.  (People evacuated were not allowed back in the city for more than a month, so many returned to sights like this.)
</p>
Carrollton neighborhood,  Uptown.
<a href="//commons.wikimedia.org/wiki/User:Infrogmation" title="User:Infrogmation">Infrogmation</a>
CC BY 3.0
<span class="int-own-work">Self-photographed</span>