Under the US act of March 2, 1907, all women acquired their husband’s nationality upon marriage, meaning U.S.-born citizen women could lose their citizenship by marriage to any non-citizen. – WTF Fun Facts
Source: https://www.archives.gov/publications/prologue/1998/summer/women-and-naturalization-1.html
Svalbard, a Norwegian archipelago with a population of 3,000, is the only visa-free zone in the world, meaning that anyone may live and work there indefinitely regardless of country of citizenship. – WTF Fun Facts
Source: https://en.wikipedia.org/wiki/Visa_policy_of_Svalbard
In Switzerland, applications for citizenship are decided at the municipal level. Thus, if your neighbors find you too annoying then they can vote to deny your citizenship. – WTF Fun Facts
In 1963, Winston Churchill was the first foreign national to receive honorary United States citizenship. He also received a passport-like document along with it which was not valid for travel. – WTF Fun Facts
Source: https://www.history.com/news/americas-honorary-citizens
Facebook co-founder Eduardo Saverin renounced his U.S. citizenship to avoid paying US$700 million in taxes. – WTF Fun Facts
Source: https://www.wsj.com/articles/SB10001424052702303360504577410571011995562