Links to other Indoor Cities:

PATH (Toronto)

http://www.toronto.ca/path/

Tokyo Midtown (Japan)

http://www.tokyo-midtown.com/en/about/index.html

Roppongi Hills (Japan)

http://www.roppongihills.com/en/

Plus 15 (Calgary)

http://www.calgary.ca/portal/server.pt/gateway/PTARGS_0_2_527194_0_0_18/Plus+15.htm

Minneapolis Skywalk (USA)

http://minneapolis.about.com/cs/shoppingservice/a/skyways.htm