This unique promotional poster for Yellowstone National Park shows the eruption of the iconic Old Faithful geyser. Yellowstone National Park was the first national park in the United States and was established by Congress and signed into law by President Ulysses S. Grant in 1872. The vast area in Northwestern Wyoming also extends into Idaho and Montana and remains one of the most visited national parks in America. Organized exploration of the area by American settlers did not begin until the 1860s. The park is nearly four thousand square miles and is home to various natural features, including a supervolcano, lakes, mountains, rivers, and canyons. Expanded access to the region with advances in roads and transportation infrastructure, as well as increased access to automobiles, caused a boom in tourism in the early twentieth century. By 1915 over one thousand cars were visiting the park every year, and by the time of this poster's illustration, it had become one of the most visited parks in the world. While tourism dipped during World War II, by the 1950s, demand for access caused park officials to implement Mission 66 in an effort to modernize park facilities. These improvements included updating structures from traditional log cabins, though these conventional structures were preserved for their unique place in the history of the park. This work was created in response to the Great Depression by noted American designer C. Don Powell, who led the WPA-FAP poster program to promote thirteen national parks across the United States.