I think that London is very much like that. I find there's humour in the air and people are interesting. And I think that it's a place which is constantly surprising. The worst thing about it? I think it can be smug and aggressive.
The rise of China as a new power is another great challenge for the US. Our failure to properly handle Germany and Japan earlier in the 20th century cost us and the world dearly. We must not make this same mistake with China.