mosttraveledman.com has a form where you can enter where you've been, and he breaks it down to countries, colonies, uninhabited island possessions, states, provinces, the works. I wouldn't want to be on the league table there: visiting the 190-something countries on the UN wouldn't put you near the top 10. (The guy who runs the site is an internet millionaire; I ran into him in, err, Pyongyang (really) and he's a nice guy living what most of us would consider a dream life.)