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.

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Hanford, Washington

A secret factory that made plutonium.

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Los Alamos, New Mexico

A covert lab that built the bombs.

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Oak Ridge, Tennessee

A hidden complex that enriched uranium.

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Plan Your Visit

Discover a Manhattan Project site near you. Plan your visit to the communities that share this story.

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Learn About the Park

Explore the history of the Manhattan Project, the land, and impacts of the first atomic weapon.

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Retweet us @MnhtnProjectNPS on Twitter.

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Last updated: January 26, 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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