I came across a link featuring graphics from cities all across the world, and including this one which charts the distribution of photos across the city, and categorizes them based on whether they are taken by locals or tourists.
You can definitely locate some of the landmarks downtown: Parliament Hill, the War Museum, the NAG and Notre Dame Basilica, the Museum of Civilization, and the War Memorial are very noticeable downtown. Some of the major spots in Gatineau Park are also noticeable: King Mtn, Kingsmere, and Pink Lake. It is interesting to notice that Hogsback Falls and Mooneys Bay have a significant concentration of photos, but almost entirely from locals.
Anyway, hope someone else finds this as interesting as I do.
The other cities.