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.

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.

A movie theater marquee reads: “The Beginning or the End. Story of the Atomic Bomb and Oak Ridge.”

Legacies

Learn about the lasting impact Oak Ridge had on the region and the world.

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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.

Left: busy city street, middle: Silhouette of Japan, Right: destruction of structures

Reflect on the atomic bombings of Japan

Visit Facebook to learn about the events leading to and following the dropping of the Little Boy and Fat Man atom bombs on Japan.

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Join the Conversation

Retweet us @MnhtnProjectNPS on Twitter.

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Like Manhattan Project National Historical Park on Instagram.

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Last updated: August 1, 2022

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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

Phone:

Hanford: 509.376.1647
Los Alamos: 505.661.6277
Oak Ridge: 865.482.1942

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