They are living giants; one of the Earth's largest and oldest trees. Some tower more than 350 feet high, taller than the Statue of Liberty; some may have been seedlings when Jesus was born. Yet these natural legends still shroud centuries-old secrets. In a major National Geographic cross-platform event, which includes the October 2009 cover story for the magazine, we'll reveal the little-explored environment of the redwoods using high-tech aerial laser surveys and breathtaking imagery.