I have lived in three cities that have subway systems. I have visited at least 4 others. It is hard to get around unless you have a map.
Amadeus is a web site dedicated to give the world a complete list of maps to all the subways on the planet.
The landing page actually has drop down menus labeled Europe, America, Australia, Asia & Middle East and Africa.
Of course, the “America” one is actually for the Western Hemisphere.
(Cities where I lived: Boston, Washington DC and Chicago. But not in that order. Visited: Dallas, NYC, LA, San Francisco (BART), Tokyo, Paris and London. Tokyo Paris, Boston, DC, San Francisco, Dallas and NYC are cities that have hosted MacWorld Expos. I didn’t visit the International cities for Expo though.)
See the maps here: http://www.amadeus.net/home/new/subwaymaps/en/index.htm#
