Treasures of America's National Parks

National Parks: Extreme Maintenance (1x3)

Air date: Jul 22, 2008

Meet the unsung heroes of America's National Parks, the dedicated men and women who work behind the scenes, often risking their lives to preserve national monuments, conserve America's unspoiled beauty, and even anticipate the forces of nature. From rappelling down the towering granite faces of Mount Rushmore to executing a prescribed burn in the Grand Canyon and plowing the treacherous Going-to-the-Sun Road in Glacier National Park, their job is riddled with danger, challenges, and rewards.