Italy, France, Germany, Belgium, Denmark, Canada, Mexico, England, Vietnam, Taiwan, and every state in the USA except Hawaii.
Spent 5 years in Italy as a grade schooler/junior high kid, and then returned as a HS student. Best time of my life! Traveled all over W Europe by train on weekends and school breaks. Got room and board at monasteries and churches in exchange for alter boy services at Mass on Sunday morning before heading back home.
My folks were really cool about it, altho my mom freaked out every weekend when I left.