Italy
a sea fort in the North Sea, located 10 km off the coast of Suffolk. It is best known for its (unrecognised) claim to be the world's smallest sovereign nation. However, it is currently regarded as a micronation by most non-Sealanders, despite its cult internet 'fanbase'.
Listen to the audio guide for Principato di Sealand Free on WIP — starts by itself when you arrive, even with the screen off