616 Zagreb; Natchez; Leave Only Footprints

Learn why Croatia's capital, Zagreb, is a hidden gem for visitors to eastern central Europe, where tourist crowds have never been a problem. Author Richard Grant tells us why Natchez is called the quirkiest town in Mississippi, and what its slave-owning history can teach America today. And reporter Conor Knighton tells us what he learned after spending a year exploring every US national park.