Park Lookout is an independent site, not the National Park Service. We are not affiliated with NPS. Confirm conditions on nps.gov before you go: official Manhattan Project National Historical Park page.
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NPS lists no current alerts for this site as of Oct 24, 2026, 9:57 PM ET.
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About this site
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. Most of this development took place in three secret communities located in Hanford, WA, Los Alamos, NM and Oak Ridge, TN. Today, you can visit these three sites that make up Manhattan Project National Historical Park.
- Type
- National Historical Park
- States
- New Mexico, Washington, Tennessee
- Address
- National Park Service, Manhattan Project National Historical Park, c/o NPS Intermountain Regional Office, P.O. Box 25287, Denver, CO 80225-0287