I actually did a formal count on this a while back. Formally (meaning beyond just airports), 26 -- countries plus territories. A few more if you also count just being in an airport there. I live in the U.S. Travel has been a passion of mine (and my husband). I lived in Asia briefly in my youth, though I am not Asian. My husband is a European. Here's my list (countries in Europe, Central and South America, and Asia):

Guam – only in airport (US territory), US Virgin Islands (US territory), Canada (Nova Scotia, Quebec, and Ontario provinces), Costa Rica, Aruba (constituent country of the Netherlands), Peru, Ecuador, England, Bermuda (UK territory), Ireland, Finland, Portugal, Spain, France, Italy, Netherlands, Switzerland, Germany, Poland, Czech Republic, San Marino (drove around part of a day), Belgium (only driving through – mostly highway), Austria (only driving through – mostly highway), China P.R.C., Taiwan R.O.C., Hong Kong, Thailand, Japan (only the airport), Iceland ? (if so, only the airport)

Q: How many states or provinces/regions have your visited in your country?