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

Multistory industrial grey concrete building with tall exhaust stack surrounded by paved lot
Hanford, Washington

Discover a secret factory that made plutonium.

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

Learn about a covert lab that built the atomic bombs.

Small white chapel with a tall steeple on a grassy hill with trees behind it on a sunny day
Oak Ridge, Tennessee

Explore a hidden complex that enriched uranium.

 A young boy presses on an interactive screen in a museum.
Plan Your Visit

Plan your visit to one of the three park locations.

A green illustrated map of the US 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 slender man in his 30s with a cigarette in right hand stares at the camera.
J. Robert Oppenheimer

Learn about the life and controversial legacy of J. Robert Oppenheimer.

 A man in a ranger uniform speaks to a group of about 30 seated people in a park
Explore the Park Calendar

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

A white bag on a rock near a stream with Peace we must accept in infinite hope written on it
Reflection & Remembrance

Start a journey of learning and reflection with materials that explore the historical traumas of the atomic bombings.

 Graphic with a green background. Black & yellow atom shaped balls with 3 large overlapping circles.
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 2, 2024

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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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