The underground "city" is a part of downtown, it's not really a city more like a district. Some may have an image of all montrealers living underground during winters but the underground city is mostly tunnels and walkways connecting downtown shopping malls, metro stations, office buildings and even some hotels. It's a great place to visit if you love to shop and walk or if it's a rainy day. Here's all the information on the underground city.
Not to be missed
Interesting web sites
Hotels, motels, etc
Bars and clubs
Family activities, sports, guided tours, etc
Monuments, historical buildings, parks, etc