Sealand is possibly the world's best-known micronation, and although its claims to sovereignty and legitimacy are not recognized by any traditional States, it is nevertheless sometimes cited in debates as an interesting case study of how various principles of international law can be applied to a disputed territory.
Sealand's royals are all believed to retain UK citizenship, and the family has not been in permanent residence on the Roughs Tower facility since 1999.
Sealand is not a member of the Universal Postal Union, which regulates the sending of mail between countries, and its address is in what it claims is a foreign country.
Sealand is a very small country in the Atlantic Ocean, but it isn't an island.
Sealand has its own stamps, national anthem, money, flag, and more things just like a real country.
Even though every other country says that Sealand doesn't count as a country, Michael Bates has good reasons why it should: Sealand is out in the ocean, and when he created it no country owned the ocean.