Montreal's underground, extensive metro system goes for miles in and around the city. One of the reasons you can exist without a car. I was always on the green line.
Shopping in Montreal - Underground City
Place Montreal Trust - The Underground City (RÉSO)- the world’s largest underground city. Over 30 kilometres of passageways connect to all #Montreal Metros and provide a refuge for tourists looking to escape the scorching heat of summer or the freezing winds of winter. With thousands of boutiques and apartments, 200+ restaurants and 34 movie theatres, this impressive underground city is regarded as both a major tourist destination and as an architectural wonder in itself.