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The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts. (Bertrand Russell). Sweet Loretta fart thought she was a cleaner, but she was a frying pan. (John Lennon)
Kind of reminds me of Vancouver as seen from Stanley Park, looking down Georgia. I've never seen Montreal look so dense. On par with Vancouver, at least from that angle.
The subway, believe it or not! Part of the Bloor-Danforth line crossing the Rosedale Valley road just west of Castle Frank station: https://goo.gl/maps/LauNDZoNrmF2
Apparently it could have been to reduce noise due to nearby (wealthy) residents. The panels on top used to be open air sections but were closed off later, I would imagine because maintenance is easier when the line is protected from the elements. Personally I find it an interesting example of modernist design, particularly the view from Rosedale valley rd.