Hi,

http://www.nationalgeographic.com/maps/
is a perfectly good URI; just try clicking on it. No redirect or anything.
However, the validator treats it as a completely broken link.
I really don't have any idea why this happens.

Joseph Eisenberg
--

The heavens declare the glory of God;
   the skies proclaim the work of his hands. Psalm 19:1


Check out the new AGO Beta site, and give us some feedback.