These countries are so small that they are not mentioned by teachers in geography classes or narrators in the news. But they exist, and in terms of size and population density, these states are completely unique! Palau Niue Saint Kitts and Nevis Principality of the Hutt River Tuvalu Nauru Principality of Seborga Republic of Molossia Maltese Order of Sealand Images: Adme ...