This documentary series covers the giants of America's conservation movement from Henry David Thoreau to Rachel Carson and beyond. Traveling the USA in my 1985 VW Vanagon camper, I visit the places that shaped the views of our great naturalists and interview the historians and biographers that know my subjects best. Utilizing the archives housed at the US Fish and Wildlife Service's National Conservation Training Center, I revisit the days when the idea of creating wilderness areas was new and helps us appreciate what these great visionaries contributed to the American landscape. Moreover, I hope to establish why the contributions these men and women made are still relevant and important today.