"America's Best Idea" (PBS)

From PBS:

Ken Burns' film on the National Park Service: The National Parks: America's Best Idea is the story of an idea as uniquely American as the Declaration of Independence and just as radical: that the most special places in the nation should be preserved, not for royalty or the rich, but for everyone. As such, it follows in the tradition of Burns's exploration of other American inventions, such as baseball and jazz.

http://www.pbs.org/nationalparks/history/ep4/