Wow. No one's thrown up the usual Mark Twain quote being, "Travel is fatal to prejudice, bigotry and narrow-mindedness." Here's the longer version.
Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it solely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one corner of the earth all one’s lifetime.
- Mark Twain
Then there's this one I like:
Perhaps travel cannot prevent bigotry, but by demonstrating that all peoples cry, laugh, eat, worry, and die, it can introduce the idea that if we try and understand each other, we may even become friends.
- Maya Angelou
And finally, not exactly a travel quote but I'm throwing in my favorite Bob Marley lyric:
Emancipate yourselves from mental slavery. None but ourselves can free our minds.
- Bob Marley