I watched this documentary on a plane the other day, it was "oddly disturbing" as the promo says. What particularly struck me was the comment that 80% of structures that we inhabit were built in the last 50 years, ie that most of what we experience with buildings really has no history before the second world war. The trailer is here:

I’m not sure where it can be seen, other than the videos on Air Canada flights. It was a NFB co-production so may be available from them.