The John Molton Barn on Mormon Row at the base of the Grand Tetons, WY / Public Domain / Jon Sullivan
Grand Teton National Park, located in northwestern Wyoming, was created in 1929 to protect the major peaks of the Teton Range. President Calvin Coolidge signed the executive order. Later in 1950, most of the northern valley of Jackson Hole was added. Today, with more additions, the Grand Teton National Park contains 310,000 acres. Combining with Yellowstone National Park, the John D. Rockefeller, Jr. Memorial Highway and surrounding National Forests, almost 18,000,000 acres are protected. It is one of the world's largest intact mid-latitude temperate ecosystems.