It seems His Highness took over ab old artillery platform outside of GB territorial waters and declared it an independent nation. I remember seeing a story on Sealand way back on 60 Minutes. The Wiki article is quite amusing.
From the article: Sealand also has its own flag, passports, currency, and national motto of “E Mare Libertas,” which is Latin for “From the Sea, Freedom.”
OK, fess up, who has a Sealand stamp in their passport?