I live in Europe so it's not so hard to travel to another country (if I drive one hour, I'm in another country.) I 've even gone to seven countries in one day (longest day of my life, though).
Here are the countries I've been to (I may forget a couple):
UK, Ireland, Belgium, France, Germany, Spain, Portugal, The Netherlands, Luxembourg, Liechtenstein, Italy, Hungary, Switserland, Austria, Slovenia, Slovakia, Poland, Denmark, Croatia, Bosnia and Herzegovina, Czech Republic, Thailand, China, Malasia, Singapore, Japan, USA, Australia
To some I've been more often than others.