One Park, Three Sites, Countless Stories

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

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Hanford, Washington

A secret factory that made plutonium.

A white building with a big sign that reads, "Los Alamos Project Main Gate"

Los Alamos, New Mexico

A covert lab that built the bombs.

A small white chapel with a tall steeple on a grassy hill with trees behind it and an historical mar

Oak Ridge, Tennessee

A hidden complex that enriched uranium.

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Plan Your Visit

Plan your visit to one of the three park locations.

A map of the United States highlighting Hanford, Los Alamos, and Oak Ridge.

Learn About the Park

Explore the history of the Manhattan Project via its people, places, culture, and events.

A black and white photo of J. Robert Oppenheimer as a young man.

J. Robert Oppenheimer

Explore the life and legacy of J. Robert Oppenheimer.

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Explore the Park Calendar

Visit the park calendar to find upcoming programs and events at all three park locations.

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Let's Get Social

Connect with Manhattan Project National Historical Park on our social media channels.

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The NPS Mobile App

Find interactive maps, tours of park places, accessibility information, and much more to plan your Manhattan Project experience.

Last updated: April 3, 2023

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Contact Info

Mailing Address:

Manhattan Project National Historical Park
c/o NPS Intermountain Regional Office
P.O. Box 25287

Denver, CO 80225-0287


Hanford: 509.376.1647
Los Alamos: 505.661.6277
Oak Ridge: 865.482.1942

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