The answer to this question changes constantly. I like to live semi-nomadically, moving from place to place relatively frequently and travelling as much as I can. So far, I've been to nearly 40 countries in North America, Europe, Africa, Asia, and Oceania, I've attended university in 4 countries, and I've lived for three months or longer at a fixed address in 5 countries.
Vancouver, Canada and Uppsala, Sweden are my two 'home bases' to which I return on occasion for whatever reason.