Manhattan Project National Historical Park

Top Secret!

The Manhattan Project was a top-secret project focused on building the world's first atomic weapons.

The Manhattan Project is one of the most transformative events of the 20th century. It ushered in the nuclear age with the development of the world’s first atomic bombs. The building of atomic weapons began in 1942 in three secret communities across the nation. As World War II waned in 1945, the United States dropped the atomic bombs on Hiroshima and Nagasaki, Japan — forever changing the world.

Oppenheimer and Groves at Trinity Test Site

J. Robert Oppenheimer and Gen. Leslie Groves at the Trinity Test Site.

B Reactor Under Construction

Constructing the B Reactor, the world's first full scale nuclear reactor, took hard work and ingenuity.

B Reactor Under Construction

Constructing the B Reactor, the world's first full scale nuclear reactor, took hard work and ingenuity.

Bruggemann Ranch

The Bruggemann Ranch was a major farm that was forcibly evacuated to create the Hanford Site.

Ashley Pond

Ashley Pond has been a central part of the Los Alamos community since the days before the Manhattan Project.

The Gadget

Norris Bradbury stands next to the Gadget, the device used in the Trinity Test.

International Friendship Bell

The International Friendship Bell in Oak Ridge, Tennessee symbolizes peace and reconciliation between the United States and Japan.

Calutron Girls

The Calutron Girls operated the arrays, or “racetracks”, at Oak Ridge’s Y-12 Electromagnetic Isotope Separation Plant during the Manhattan Project.

Front Drive View

Site #23

RecAreaDirections

Manhattan Project National Historical Park is located in three states: New Mexico, Tennessee, and Washington. For more information on accessing each of these three units, visit our Directions & Transportation page.

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Facilities

Tri-Cities Visitor Center Visitor Center

OPEN: Visit Tri-Cities is the tourism information center for the local area. This is a great place to stop by for helpful trip-planning advice for visiting the park and numerous other attractions in the Tri-Cities. The helpful staff can provide you with itineraries for visits to the Tri-Cities region and suggest entertainment, lodging, and dining options. You may also purchase souvenir items and stamp your national parks passport here. Visit Tri-Cities may be reached at 509-735-8486.

Oak Ridge Visitor Center Facility

The Oak Ridge Visitor Center is located within the Children's Museum of Oak Ridge. Here you are able to speak with National Park Service rangers, watch a short film on the Manhattan Project, and get literature on Manhattan Project-related historic sites throughout Oak Ridge.

Hanford Visitor Center Facility

Note: The visitor center will be open and tours will be available when the COVID-19 Community Level for Benton and Franklin counties is designated “medium/yellow” or lower by the Centers for Disease Control and Prevention (CDC). Located in the city of Richland, this is the main visitor contact point for the Manhattan Project National Historical Park in the Tri-Cities.

Los Alamos Visitor Center Facility

At the Los Alamos Visitor Center you can speak with park rangers, tour exhibits about the Manhattan Project in Los Alamos, and learn more about where to go in town.

Recreation Areas and Campground Database