Toronto also has a quite extensive and successful underground mall - the 'Path' - but I'd imagine it's success is in part due to the climate. Walking undergroun

Toronto also has a quite extensive and successful underground mall - the 'Path' - but I'd imagine it's success is in part due to the climate. Walking underground is vastly preferable to above ground for a good portion of the year. It also allows access from Financial District office towers to Union Station unimpeded by traffic lights.