Where can I find a list of all the aiports in the world that have shower facilities?

Answer 1

Get a membership here:
Priority Pass
http://www.prioritypass.com/Lounges/index.cfm

OR
Go through this site:
The Budget Traveller's Guide to
Sleeping in Airports

http://www.sleepinginairports.net/bestof.htm

Go down half the page and you'll see a list
of Airports w/ free and pay showers.
http://www.sleepinginairports.net/results.htm

Answer 2

Here is a list of airports with terminal information. You'll have to call about the shower facitlites: http://www.legfind.com/sitemap.aspx?sitemap=airports