london
I'm american and I know that London is the capital of England not vice versa. Most of us aren't idiots that's just a ignorant stereotype. But anyway London is basically the Manhattan of England. Extremely expensive, good eating, good shopping, history, etc. Basically it is a must see city.
Us "Yanks" aren't stupid or ignorant as the media makes us look. Give us a chance. Yes 97% of us know, London is the capital of England. If I asked a Englishmen what  the capital of the state of Louisiana was,  would he know? Maybe, maybe not the point is we both don't know  a lot about each other's culture.