Manhattan Project National Historical Park

The Manhattan Project was a top-secret project focused on building the world's first atomic weapons.
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.
Map showing location of park.
A man dressed in a park ranger uniform stands behind a desk pointing something out to a visitor.
Visitor Spending for Manhattan Project NHP Contributes $5.4 Million Across Three Communities
A new National Park Service report shows Manhattan Project National Historical Park had a total of 74,693 recreation visits across its 3 park units in 2024. These visits led to a total of approximately $5.4 million in visitor spending in local communities parkwide.
A digital rendering of a Manhattan Project National Historical Park 10th Anniversary logo
Manhattan Project National Historical Park Celebrates 10 Years with Special Events in Oak Ridge
Celebrate Manhattan Project National Historical Park's 10th anniversary on Thursday, November 13, 2025, with special events throughout Oak Ridge, Tennessee.
Dozens of people gather, waving and holding newspapers.
Manhattan Project National Historical Park Marks 80th Anniversary of VJ Day With Special Program in Oak Ridge
Marking the 80th anniversary of VJ Day, the Oak Ridge, TN unit of Manhattan Project National Historical Park is offering a special guided tour of Jackson Square on Thursday August 14, 2025 from 12:30-1:00 PM EST.
A white bag with a black peace sign drawn on it is illuminated at dusk with a lake in the background and reflecting lights.
Manhattan Project National Historical Park hosting days of Peace and Remembrance in Los Alamos, NM in Observation of the 80th Anniversary of Atomic Bombings of Japan
- Manhattan Project National Historical Park (NHP), in partnership with Pearl Harbor National Memorial (NM), will host "Days of Peace and Remembrance" across its three sites and at Pearl Harbor NM to commemorate and reflect on the 80th anniversary of the atomic bombings of Japan in 1945. This commemorative programming acknowledges and interprets the conflicting viewpoints, both historical and modern, that surround the development and use of the world’s first atomic weapons. These events provide an opportunity for somber, quiet reflection.
Luminarias line a path around a large bronze bell in a city park.
Manhattan Project National Historical Park hosting days of Peace and Remembrance in Oak Ridge, TN for 80th Anniversary Observance of Atomic Bombings of Japan
Manhattan Project National Historical Park (NHP), in partnership with Pearl Harbor National Memorial (NM), will host "Days of Peace and Remembrance" across its three sites and at Pearl Harbor NM to commemorate and reflect on the 80th anniversary of the atomic bombings of Japan in 1945. This commemorative programming acknowledges and interprets the conflicting viewpoints, both historical and modern, that surround the development and use of the world’s first atomic weapons. These events provide an opportunity for somber, quiet reflection.
Historic photo of two men standing next to a mangled piece of metal equipment in the desert.
Photo by Los Alamos National Laboratory
Gray factory building like stacked boxes with single taller smokestack beneath cloudy blue skies.
Photo by NPS
Uniformed park ranger talks animatedly to visitors on a hillside overlooking a sprawling urban area.
Photo by NPS
Two-story white house with two small windows, a single door, and flat roof stands in a gravel lot.
Photo by NPS
Uniformed park ranger points to distance of fountain and trees as visitors sit enraptured.
Photo by NPS
Wooden chair sits amid light blue paneling covered in dials, meters, screens, and buttons.
Photo by NPS
Uniformed park ranger stands with youth along path lined with green broadleaved trees.
Photo by NPS