The "dean of western writers", American Pulitzer prize-winning author Wallace Stegner, has written that national parks are 'America's best idea,'—a departure from the royal preserves that Old World sovereigns enjoyed for themselves—inherently democratic, open to all, "they reflect us at our best, not our worst."^[4]Even with the creation of Yellowstone, Yosemite, and nearly 37 other national parks and monuments, another 44 years passed before an agency was created in the United States to administer these units in a comprehensive way — the U.S. National Park Service (NPS). Businessman Stephen Mather and his journalist partner Robert Sterling Yard pushed hardest for the creation of the NPS, writing then-Secretary of the Interior Franklin Knight Lane about such a need and spearheading a large publicity campaign for their movement. Lane invited Mather to come to Washington, DC to work with him to draft and see passage of the NPS Organic Act, which was approved by Congress and signed into law on August 25, 1916. Of the 395 sites managed by the National Park Service of the United States, only 58 carry the designation of National Park.

Grand Prismatic Spring in Yellowstone National Park,Wyoming, U.S.A. Yellowstone was the first national park in the world.

Following the idea established in Yellowstone there soon followed parks in other nations. In Australia, the Royal National Park was established just south of Sydney in 1879. Rocky Mountain National Park became Canada's first national park in 1885. New Zealandestablished Tongariro National Park in 1887. In Europe the first national parks were a set of nine parks in Sweden in 1909; Europe has some 359 national parks as of 2010.^{[citation needed]} Africa's first national park was established in 1925 when Albert I of Belgium designated an area of what is now Democratic Republic of Congo centred around the Virunga Mountains as the Albert National Park (since renamed Virunga National Park). In 1973, Mount Kilimanjaro was classified as a National Park and was opened to public access in 1977.^[5] In 1926, the government of South Africa designated Kruger National Park as the nation's first national park. After World War II, national parks were founded all over the world. The Vanoise National Park in the Alps was the first French national park, created in 1963 after public mobilization against a touristic project.