There's also the largest "underground city" in Montréal, Québec to avoid winter. It links up universities, stores, offices, subways and much, much more!
It's ironic because if you visit Montréal in the summer everyone is outside.
Also, if a French Canadian take you to lunch, expect to eat for 1+ hour. No such thing as a quick lunch.
I lived in Chicago which has something similar, and never went down there except to take the train. It's all chain stores that have "upstairs" versions as well. Good if you're walking around outside and you notice there's a tornado heading your way, though.
It's probably indicative that it's nice for everyday residents. Most people's lives are pretty mundane.
Wait what? How?
Tho technically you get a bit of fresh air for that one.