"I love Paris and Rome, but students will learn far more if they step into different worlds where life is rather more different — say, India, or Burundi, or Bolivia. It's important to get out of our comfort zones, both because of what we learn about the rest of the world and also for the...

"[International travel] is very important not only for individuals but also for the country as a whole. The U.S. has periodically made policy blunders because we tend not to appreciate the way our country is seen by foreigners; we often fail to understand the prism of suspicion through which any American action is perceived by...