VIDEO : 'National Parks Adventure,? Featuring the Narration of Robert Redford, is the Highest Grossi

MacGillivray Freeman?s ?National Parks Adventure,? featuring the narration of Oscar winner Robert Redford, is now the highest grossing documentary of the year. ?National Parks Adventure? carries a somewhat short 45-minute runtime and takes viewers to the red rock canyons, over mountain peaks and several other locations within Yellowstone, Glacier, Yosemite and Arches national parks. var googletag = googletag || {}; googletag.cmd = googletag.cmd || []; googletag.cmd.push(function() { googletag.