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
May 13, 2026
Discover Manhattan Project History This Summer with Free Ranger Led Programs
Richland, W.A. – Manhattan Project National Historical Park is offering a lineup of free ranger programs this summer, inviting visitors to explore the history, science, and people behind the Manhattan Project.
May 5, 2026
Manhattan Project National Historical Park to Offer Fishing Education for Local Youth This Summer
Manhattan Project National Historical Park in Oak Ridge, Tennessee will offer monthly fishing education programs, Let’s Go Fishing, in June, July, August and September.
Mar 31, 2026
Manhattan Project National Historical Park 10th Anniversary in Oak Ridge
Celebrate the 10th anniversary of Manhattan Project National Historical Park on April 30, 2026 with special events throughout Oak Ridge, Tennessee.