It began as a radical idea to preserve a mysterious land of “boiling sulpher springs.” Now the National Park Service is 100 years old – with more than 400 places we’ve seen fit to save forever. Smithsonian Channel will celebrate the centennial with AMERICA’S NATIONAL PARKS AT 100 premiering Sunday, August 28 at 8 p.m. ET/PT. The one-hour special tells the story of how this radical idea evolved into an enduring mission shaped by the creativity, resourcefulness and passion of individual Americans.