Spread across three states is the Manhattan Project National Historical Park in Tennessee, Washington, and Arizona. Each area focused on a different part of the process in creating the atomic bomb and visitors can learn more about the different aspects and impact of the atomic bomb. In Tennessee, in the hills of Appalachia, they enriched the uranium and visitors now can go on a tour of the facility. In Washington, in the rain shadow of the the Cascades, they focused on making plutonium and visitors now can learn more about the towns and social life that developed around this production. Finally, in Arizona, on a plateau, was the facilities that built the bombs, and now visitors can explore the historic sites. The Manhattan Project involved hundreds of workers, often working in secrecy, during World War II, and the sites examine the people involved, the science that led to the development of the atomic bomb, the lives of those impacted, and the impact on the land. Each site is located in a fairly rural area that allows visitors to not only learn more about the history of the atomic bomb, but also visit some remote, but beautiful locations throughout the United States.