This view of the east branch of Rideau Falls is taken from the outlook on Green Island. The building you see on the other side formerly housed a pavilion on Canada and the world, but had stood empty for some time. It was recently in the news that it will have a new occupant starting next year: the Royal Canadian Geographical Society is going to be using it as exhibit space starting in the spring, which is a fitting choice for the location.
Green Island of course has several military monuments. It also had a flock of Canada geese on the grass that day, amid the fall colours.