Ken Burns on National Parks

Ken Burns waxes poetic to Dave Letterman on the subject of his latest documentary: national parks. We're packing for Yellowstone now.

Updated Apr. 25, 2017 2:03PM EDT / Published Aug. 20, 2009 4:47AM EDT

Ken Burns waxes poetic to Dave Letterman on the subject of his latest documentary: national parks. We're packing for Yellowstone now.