From Mount Rushmore to the Minuteman Missile site, National Parks are big business in South Dakota.
The National Park Service says they lured nearly 4 million visitors into South Dakota in 2013.
The report also says all of those visitors had a $239 million impact on the state and created 3,700 jobs.
South Dakota's national parks are Mount Rushmore National Memorial, Wind Cave National Park, Jewel Cave National Monument, Badlands National Park and Minuteman Missile National Historic Site.
Review the 2013 Visitor Spending Effects Report online.