The stat with the size of two tennis courts

Sealand or the Principality of Sealand, a state the size of two tennis courts, declared independence from Britain in 1967, occupying the former British fort Maunsell Fort in the North Sea.

According to Digi24, With its own currency, postmarks and constitution, Sealand is not recognized by any UN member state. With only one permanent resident, Michael Barrington—who serves as a watchman, electrician, and mechanic—Sealand remains an unconventional entity, fighting for international recognition for over 50 years.

The Bates family, led by head of state Prince Michael, originally set out to turn Sealand into a tax haven or luxury casino island. With grand ambitions and failed collaborations in recent years, including plans to turn it into an offshore data haven, Sealand has racked up an unspecified debt. Today, the Bates family is in the seafood business and botox treatments, and Sealand remains an economic enigma. Even after six decades of existence, Sealand's royal family hopes the "golden age" is at hand and remains committed to its goals, with a confident attitude to any challenge from the British Navy.