Established in 1916 by the federal government, the National Park Service strives to preserve, protect and maintain the natural, historical and recreational resources of the United States. The idea for a national parks organization is credited to George Catlin who, in 1832, grew concerned with America’s expansion into the West. Today, the Park Service includes over 390 parks in the United States and its territories, including Yellowstone, Yosemite, the Grand Canyon and Gettysburg.

The National Park Service depends on seasonal employment to keep its sites functioning. The Park Service suggests that anyone interested in park internships contact the individual park directly to ask about available positions, as the programs are competitive, especially at the better known parks. In addition to park positions, cultural resource internships are offered, involving archaeology, curatorial and museums, history and historic architecture. The National Park Service Student Conservation Association also offers several volunteer programs.