Happy birthday, National Park Service! Established in 1916 to preserve our national treasures and help tell the American story, the men and women of the National Park Service greet you with a smiling face and helping hand from world famous parks like Yellowstone National Park in Wyoming to little known historic and cultural sites across the country. So many of us remember our first trips to parks and the powerful stories, amazing sights and thrilling experiences that keep us connected to these special places. Thanks for celebrating with us! Photo at Yellowstone National Park by Jacob W. Frank, National Park Service.