J. Robert Oppenheimer and Gen. Leslie Groves at the Trinity Test Site.
Photo: Los Alamos National Laboratory
About
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. Most of this development took place in three secret communities located in Hanford, WA, Los Alamos, NM and Oak Ridge, TN. Today, you can visit these three sites that make up Manhattan Project National Historical Park.
Activities
Guided ToursJunior Ranger ProgramPark FilmMuseum Exhibits
Directions
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.
Get directions →Weather
The Manhattan Project National Historical Park has units in Hanford, WA, Los Alamos, NM, and Oak Ridge, TN. Check local weather conditions at each unit before you visit.
News
Sep 30, 2025
Visitor Spending for Manhattan Project NHP Contributes $5.4 Million Across Three Communities
A new National Park Service report shows Manhattan Project National Historical Park had a total of 74,693 recreation visits across its 3 park units in 2024. These visits led to a total of approximately $5.4 million in visitor spending in local communities parkwide.
Sep 30, 2025
Manhattan Project National Historical Park Celebrates 10 Years with Special Events in Oak Ridge
Celebrate Manhattan Project National Historical Park's 10th anniversary on Thursday, November 13, 2025, with special events throughout Oak Ridge, Tennessee.