Life magazine and Google have cooperated to put several centuries of photos online, many of them previously unpublished.
For our purposes, there is an impressive collection of prime ministers, at least of a certain vintage—namely Trudeau, Diefenbaker, Pearson and St. Laurent. The Mackenzie King file would seem to mostly include pictures from his funeral. Elsewhere, there are photos of presidents Kennedy and Eisenhower addressing Parliament.
Then there are the random finds like this shot of former air minister Charles G. Power, grandfather of Foreign Affairs Minister Lawrence Cannon.
Best find so far: The Queen square-dancing at Rideau. Nice poodle-skirt, your majesty.