http://onthisspot.ca/vancouver.html
The Vancouver Then and Now Series includes photographs of Downtown, Gastown, Stanley Park, Kitsilano, and the North Shore.
A very effective interactive presentation of Then and Now, in which you simply follow these instructions:
Mouse over images with red borders to see into the past.
For mobile tap once. Tap again outside the image to return to the present.
And you can do this as many times as you want to seek out points of comparison.