How many of Canada's national historic sites are located outside Canada?

Polly, I visited both sites on the 100th anniversary of Vimy Ridge, as a former military man myself to show respect for my Grandfather who was a combatant at the Ridge. It was an incredibly moving experience. Literally 1000's of bodies were simply "lost" in the mud. The whole area is virtually a massive grave.

I swear I'm Canadian, but I got that wrong. And ex Army to boot!! I was baffled, this really is an incredible question. Respect!