Do you ever wonder who really runs the travel industry? We're not talking about the corporate CEO's or hotel general managers, but rather, the people who load your bags on the plane or bring the towels to your room. CBS News Travel Editor Peter Greenberg calls them "The Invisibles", and explains how they make a critical difference every time you travel. Plus, it's not just about cheese. Peter takes us to tribal Indian nations: a hidden gem of Wisconsin. And, while the Corinthia London is a fairly new hotel in New York City, correspondent Tracy Gallagher reveals that it has quite a compelling history.