Did you know that the City of London and London are two different places? Sure, one actually lives within the other, but they have separate mayors, plus the Queen actually has to ask to enter the City of London. But how did this strange arrangement arise?
I knew the City of London was a small, one-mile square in the middle of London, but I didn't know it was something akin to the Vatican. It's not actually its own country, but it apparently has different voting regimes, and its own police force. The more you know. [YouTube]