This Concrete Speck in the North Sea Is a Country - The Principality of Sealand has its own flag, a white diagonal stripe dividing fields of red and black. It has currency, postage stamps, a national anthem (“E Mare Libertas,” which is also its national motto, meaning “from the sea, freedom”), and even a soccer team. Never heard of Sealand? That’s not a surprise. It’s a concrete dot in the North Sea roughly the size of two tennis courts.
The Principality of Sealand: During the Second World War the British government built several Fortress islands in the North Sea to defend its coasts from German invaders. These forts were built illegally in international waters.