The 'Discover America' series takes you behind the scenes and beyond the well trodden tourist path to America's most popular National Parks and modern wonders. Giant Sequoias are the largest (many have trunks over 28' in diameter, with the tallest trees rising over 300') and among the oldest, living organisms on the face of the earth. Millions of years ago sequoias grew all over the Northern Hemisphere, including Europe and Asia. Today, Giant Sequoias grow only on the western slope of California's Sierra Nevada in a 70 mile corridor between Sequoia and Kings Canyon National Parks and in the Giant Sequoia National Monument. Mariposa Grove is home to one of the largest and oldest groves of these ancient giants still surviving today. Truly a wonder of nature, these prehistoric trees still stand in exalted, majestic silence among the other members of the forest community they harmonise with. Walt Danneman, driver and narrator, will explain and show you the highlights of one of Yosemite National Park's brightest gems, the Mariposa Grove of Giant Sequoias. See the grove's most famous trees, filmed with outstanding digital footage to capture their brilliant colours. Hear commentary on the grove's remarkable ecosystem, it's fascinating history and preservation, and understand for yourself the astonishing amount of time it takes to create the world's largest trees: the Giant Sequoias of Mariposa Grove.