It turns out that there's an installation in international waters off the coast of Norway called Aasgard. I noticed this. Then I noticed that the tables had a lat/long for it. Then I went to google maps. Sadly, the magnifcation on google maps and google earth doesn't seem to be big enough to show Asgard, but the link to see for yourself is here
Norway apparently has a number of these things, but none of the other ones have names that cool/geek-friendly.
The UN does not yet have a location code for Sealand.