Writer Dayton Duncan discusses the practice of collecting parks and introduces Tuan Luong, a climber and photographer who was so captivated by the splendor of the national parks that he decided to continue his studies in California just to be near El Capitan and Yosemite National Park, in Ken Burns's newest film, THE NATIONAL PARKS: AMERICA'S BEST IDEA, premiering Sunday-Friday, September 27-October 2, 2009.