Adding to the list, I found Canada's cold war museum to be really interesting. Known as the "Diefenbunker", the museum was actually an underground government shelter for 500 high ranking officials in case of an attack. Very little of it is off-limits and the ominous feel of the place is still very present. It's a short drive outside Ottawa and definitely worth the detour if you're into that kind of stuff.
I remember driving by the Bomarc site as a kid to visit my grandparents. There was also the remains of a Pinetree Line station further north that you could see from the highway. It's gone now, but I always wanted to see inside
