abDoug
hard to do a good job of adding it with current aerial image
It certainly is a major landmark, and worth adding.
Not protected, but listed as historical site:
http://www.calgary.ca/PDA/pd/Pages/Heritage-planning/Discover-Historic-Calgary-resources.aspx?dhcResourceId=502
(lots of historical sites could be added to the map, if someone is looking for something to keep them occupied of a cold winter's evening)