Embed Geacron Map

I have this embed code for a Geacron map:

<iframe width="500" height="500" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="http://geacron.com/map/atlas/embed.html?lang=en&w=500&h=500&z=3&x=19.335939612066&y=3.5945629440399&nd=0&d=1575A1883A1885A1887A1890A1893A1895A1925A1955A2015&tm=p&ly=yyyy"></iframe>

I’m trying to use it to insert the map into a blog post, using the web interface WordPress post editor. The embed code was generated from here:

http://geacron.com/en/?v=m&lang=en&z=3&x=12.304689260207&y=6.046605992768&nd=0&d=1575A1883A1885A1887A1890A1893A1895A1925A1955A2015&di=1575&tm=p&ct=0&ly=yyyyyyy&fi=-500&ff=1500&sp=2&e=0&rp=0&re=0&nv=2

Only thing is, when I paste the embed code in, nothing appears when I publish the post. How to fix this?

My site: http://plumablogs.org/2015/09/26/we-created-dictators/

Wil