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. Read More
Discover a secret factory that made plutonium.
Learn about a covert lab that built the atomic bombs.
Explore a hidden complex that enriched uranium.
Plan your visit to one of the three park locations.
Explore the history of the Manhattan Project via its people, places, culture, and events.
Learn about the life and controversial legacy of J. Robert Oppenheimer.
Visit the park calendar to find upcoming programs and events at all three park locations.
Start a journey of learning and reflection with materials that explore the historical traumas of the atomic bombings.
Find interactive maps, tours of park places, accessibility information, and much more to plan your Manhattan Project experience.
Last updated: April 2, 2024
National Park Service, Manhattan Project National Historical Park c/o NPS Intermountain Regional Office One Denver Federal Center, Building 50 Denver, CO 80225-0287
Hanford: 509.376.1647 Los Alamos: 505.661.6277 Oak Ridge: 865.482.1942
