Over the course of nearly 30 years, park enthusiasts Margaret and Edward Gehrke from Lincoln, Nebraska, made pilgrimages to national parks across the country. As seen in this clip from Ken Burns's newest film, THE NATIONAL PARKS: AMERICA'S BEST IDEA, Margaret would record the start of every trip as "the day of days" in her journal. Edward would bring along his Kodak camera, snapping pictures Margaret would later carefully place in photo albums to commemorate their adventures. The National Parks debuts on DPTV on Sept. 27.