Dawn of the Atomic Age

This site tells the story about the people, events, science, and engineering that led to the creation of the atomic bomb, which helped end World War II.

Image of historic entry gate in Los Alamos, New Mexico

Los Alamos

Find out more about the Manhattan Project site in Los Alamos, New Mexico.

Calutron Girls at Oak Ridge Site

Oak Ridge

Find out more about the Manhattan Project site in Oak Ridge, Tennessee.

Image of Hanford Reactor

Hanford

Find out more about the Manhattan Project site in Hanford, Washington.

A dramatically lit black and white photo of an origami crane on a table

75 years since Hiroshima and Nagasaki

Manhattan Project National Historical Park is marking 75 years since the atomic bombings of Japan in the waning days of World War II.

Last updated: July 7, 2020

Contact the Park

Mailing Address:

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

Denver, CO 80225-0287

Phone:

(505) 661-6277
This phone number is for the Los Alamos Unit Visitor Center. You may also contact the Oak Ridge Unit Visitor Center at (865) 482-1942, or the Hanford Unit Visitor Center at (509) 376-1647.

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