Although Congress set aside Yellowstone National Park in 1872, there was no real system of national parks until a federal bureau, the National Park Service, was created on August 25, 1916 to manage those areas then assigned to the U.S. Department of the Interior. National Parks represent the grand diversity that is America. This deck of cards takes you on a photographic tour of the national parks. Each card has is own unique photo from an American National Park, Monument or Memorial. 3-1/2 X 2-1/2" Cards.