While THIS ARTICLE is targeted to young adults, it does have some great reasons to travel while you are young which apply to the much younger crowd that we have.
I know that from my own personal travels, my children have met a wide range of people, are more polite and accepting of people that are different, hopefully are more worldly and intelligent (sometimes I wonder), and have a decided appreciation for what it is that we have here in the U.S.
When a teacher tries to prevent travel, I tend to dig in my heels and insist. My kids are all on their second set of passports-not because they expired, but because they were filled. Travel IS an education.