While not on the same scale as Toronto's underpass, the Université Laval in neighboring Quebec has an underground walkway linking many of the building, including some of the dorms. Once when I was studying there I went to class in slippers from my dorm, without stepping outside. Though even during winter I didn't use them much, I found a bit too depressing to stay cooped up inside all day long, plus a few parts were very crowded.

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morkalork a day ago | parent [-]

Carleton university in Ottawa has something like 5km of tunnels connecting every building on campus. What can I say, Canadians have oddly dwarven compulsions to dig underground complexes?

	▲	bluGill a day ago \| parent [-]
		The university of Minnesota has a lot of tunnels. they were put into place because there is a central steam place and maintenance needs to inspect those pipes, but they are also open to anyone to use (or were when I went there year ago). When it was very cold it was nice to be able to get around - but often the tunnels were not very direct so I didn't use them much.