So as it's colder now (it's currently a rare day if it reaches 0 degrees), people tend to spend a bit more time indoors while travelling around. Thankfully in Toronto you can do this. It is possible to travel a long way around downtown via the PATH system, a network of underground tunnels in the downtown core. 27 km of tunnels connect the major buildings of downtown with pedestrian access throughout the area.
Our closest entrance is just beside the CN Tower and from there we can get to the Atrium on Bay north of Dundas Street on Yonge just over a kilometre away in a straight line. This works out to be about two kilometres by foot through the PATH system.
It's not just a series of bland tunnels though, every km of the system has shops, dental surgeries, food courts, post offices and all manner of services. In fact it qualifies as the largest underground shopping complex in the world. The majority of it is open 24 hours a day (the section through The Bay closes late at night due to the fact it goes right through the heart of the department store.) There are six subways stations, one mainline station, two concert halls, a convention centre, sports stadium, at least four major hotels, the headquarters of all of Canada's major banks and the City Hall connected to the system. You walk through office buildings that you wouldn't normally consider entering, though that is quite commonplace in Canada as most office buildings have public access facilities on the ground floor (and sometimes elsewhere.)
It's a really strange place, a little tricky to find your way around, but we're getting there. Just on Thursday night we were trying to find a restaurant connected to the system in BCE Place, and ended up walking about a kilometer and a half when if we'd taken a different turning straight out of Union Station it was only a block away. It's all part of the learning process.