Just in time for summer, Melissa Biggs Bradley sits down with the Emmy-winning CBS Sunday Morning correspondent and author of Leave Only Footprints: My Acadia-to-Zion Journey Through Every National Park and learns what it’s like to visit all 59 U.S. National Parks (and why your visits matter), why the great American road trip has never been easier, how you know travel is part of your life story and more. http://www.conorknighton.com