3 April 2014 / #maps Archival photo showing a model of a mushroom cloud detonating in Cold War-era OttawaSeen on the Canadian Civil Defence Museum Association web site : “Ottawa Atom Mushroom Cloud Model Used in Canadian Civil Defence Course”. Yikes.[ ](http://ottawastart.com/wp-content/uploads/2014/04/Ottawa-Ground-Zero-web.jpg)****(Thanks @koolie62 for the tip!)**** ** See also: ** Ottawa History GuideIf you liked this post, you should ** subscribe to etcetera , ** our free email newsletter. Featuring cool Ottawa events, interesting local news and contests and giveaways. Thanks!