History & Culture

The Manhattan Project was a massive, top secret national mobilization of scientists, engineers, technicians, and military personnel charged with producing a deployable atomic weapon during World War II. The project began as a multifaceted effort requiring the rapid advancement of nuclear physics and multiple engineering strategies to produce functional weapons designs and critical quantities of fissile materials, and produced weapons of unprecedented destructive capacity. The project included the Trinity Test on July 16, 1945, a few weeks before the United States dropped atomic bombs on Hiroshima and Nagasaki, Japan.

Coordinated by the US Army, Manhattan Project activities were located in numerous locations across the United States. Manhattan Project National Historical Park incorporates three of the most significant locations, each of which played an essential role in the Manhattan Project: Oak Ridge, Tennessee; Los Alamos, New Mexico; and Hanford, Washington.

Learn more about the Manhattan Project below.

African Americans at Los Alamos and Oak Ridge: A Historic Context Study

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    Women Scientists and the Manhattan Project

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      African American Scientists and the Manhattan Project

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        Last updated: April 15, 2021

        Contact the Park

        Mailing Address:

        Manhattan Project National Historical Park
        c/o NPS Intermountain Regional Office
        P.O. Box 25287

        Denver, CO 80225-0287


        (505) 661-6277
        This phone number is for the Los Alamos Unit Visitor Center. You may also contact the Oak Ridge Unit Visitor Center at (865) 482-1942, or the Hanford Unit Visitor Center at (509) 376-1647.

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