Travelers' Century Club
which is: http://www.travelerscenturyclub.org
Their current list of countries can be seen on their web site.
I have copied the last list I have seen published, which
was in the June 1996 issue of International Travel News.
In the April 23, 2000 edition of the Pacific Daily
News,
the address is now:
Travelers' Century Club
Box 7050
Santa Monica, CA 90406-7050
(310) 393-7419