This PBS special celebrates one of Ken Burns' most beautiful and beloved series, The National Parks: America's Best Idea. Filmed over the course of more than six years at some of nature's most spectacular locales - from Acadia to Yosemite, Yellowstone to the Grand Canyon, the Everglades of Florida to the Gates of the Arctic in Alaska - the series is filled with incidents and characters as gripping and fascinating as American history has to offer.