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.

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Oak Ridge, Tennessee

A hidden complex that enriched uranium.

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Learn about J. Robert Oppenheimer

Learn about J. Robert Oppenheimer through this first article in a three-part series.

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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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Retweet us @MnhtnProjectNPS on Twitter.

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Last updated: March 22, 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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