Subways of the world

One of the best ways of visiting a big city is to do so by subway or by tram. List of subways to help you avoid road traffic jams: the subway gets you to your destination quickly.
To help you plan your itinerary, Levoyageur has attempted to make available the websites and maps of all the subways and tramways of the major cities in the world.
Please feel free to request the addition of cities that are not currently listed below.