In the 1930s the Civilian Conservation Corps (CCC) helped mold much of the memorial's surrounding landscape, including an iconic grass alleyway leading from the memorial center to the pioneer cemetery. In 1934, a CCC crew located and excavated the original hearthstones of the Lincoln family farm. These workers also helped plant more than 22,000 native trees to restore that part of the county to something similar to the wilderness a young Abraham Lincoln would have seen when his family first came to Indiana. Today, high school students continue helping maintain and improve the national park through the Youth Conservation Corps.