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.
Location
National Park Service, Manhattan Project National Historical Park
c/o NPS Intermountain Regional Office
Denver, CO 80225-0287
Hours
wednesday9:00AM - 4:00PM
monday9:00AM - 4:00PM
thursday9:00AM - 4:00PM
sundayClosed
tuesday9:00PM - 4:00PM
friday9:00AM - 4:00PM
saturdayClosed
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.