Several cities in the colder parts of the US and Canada have extensive networks of enclosed pedestrian bridges, such that you could cross downtown without ever

Several cities in the colder parts of the US and Canada have extensive networks of enclosed pedestrian bridges, such that you could cross downtown without ever going outside. For example, see Minneapolis https://en.wikipedia.org/wiki/Minneapolis_Skyway_System https://en.wikipedia.org/wiki/Minneapolis_Skyway_System