More northern cities like Montreal and Winnipeg also have very interesting indoor pedestrian systems. The one in Winnipeg is particularly useful, since there ar

More northern cities like Montreal and Winnipeg also have very interesting indoor pedestrian systems. The one in Winnipeg is particularly useful, since there are approximately 72 hours per year that it's comfortable to be outside between the bone-chilling cold and the biblical swarms of mosquitos and flies in the summer. https://en.wikipedia.org/wiki/Underground_City,_Montreal https://en.wikipedia.org/wiki/Underground_City,_Montreal https://en.wikipedia.org/wiki/Winnipeg_Walkway https://en.wikipedia.org/wiki/Winnipeg_Walkway