The Association of Science and Technology Centers also has a "passport"
kind of program. Buy a passport ticket at any participating museum (about
400 worldwide) for around $50, and get free entry into any other
participating museum.

That 'ol link would be http://www.astc.org/info/passport.htm

Not sure if this is what the original question was concering, but an
interesting program none the less.

- Roy

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