National Historic Preservation (NHP) efforts at the K-25 Site will honor the men and women who designed, built, and operated the world's first gaseous diffusion plant and the hundreds of facilities and structures that followed. For more than 70 years, the site and its people have delivered defense, energy, and environmental cleanup missions that have helped end war, fuel nations, and restore the local landscape.

The Department of Energy has commemorated the site's contributions through the opening of the K-25 History Center. In the spot where the story began, visitors can now explore the rich history of this Manhattan Project site, cloaked in secrecy and driven by urgency.

The History Center's exhibits and displays feature building equipment replicas, period artifacts, and worker oral histories.

The K-25 History Center is located at 652 Enrichment Street in Oak Ridge, Tennessee, on the top floor of the City of Oak Ridge Fire Station 4.  Visitor hours are listed on the American Museum of Science and Energy website.

Future planned commemorative facilities will include a cross-section of K-25's gaseous diffusion cascade (learn about the K-25 Building) to be recreated in an Equipment Building and a structure that provides the visitor with a view of the size, scale, and proportions of the K-25 Building. 

National Park Service-style wayside exhibits will provide additional information about the site, its people, and its missions.

In December 2014, the footprint of the former K-25 Building and other historic facilities in Oak Ridge became part of a larger preservation effort through the National Defense Authorization Act, authorizing establishment of a Manhattan Project National Historical Park. Current NHP activities will complement plans for the multi-site park..