manhattan-project | NM | Find park

Historic photo of two men standing next to a mangled piece of metal equipment in the desert.

J. Robert Oppenheimer and Gen. Leslie Groves at the Trinity Test Site.

Gray factory building like stacked boxes with single taller smokestack beneath cloudy blue skies.

The B Reactor, located along the Columbia River in Washington, was the world’s first full scale nuclear reactor.

Uniformed park ranger talks animatedly to visitors on a hillside overlooking a sprawling urban area.

A hike with a Hanford park ranger can lead to new insights and perspectives of the local area.

Two-story white house with two small windows, a single door, and flat roof stands in a gravel lot.

Historic structures endure at Los Alamos, preserving the legacies and untold stories of this important chapter in world history.

Uniformed park ranger points to distance of fountain and trees as visitors sit enraptured.

Park rangers engage visitors in several locations across the Los Alamos area.

Wooden chair sits amid light blue paneling covered in dials, meters, screens, and buttons.

Many locations at the Oak Ridge site can be accessed through guided tours coordinated by the US Department of Energy.

Uniformed park ranger stands with youth along path lined with green broadleaved trees.

An outing with Oak Ridge park rangers is fun for the whole family.

Physical Address:

National Park Service, Manhattan Project National Historical Park

c/o NPS Intermountain Regional Office

Denver, CO 80225-0287

Mailing Address:

National Park Service, Manhattan Project National Historical Park

c/o NPS Intermountain Regional Office

Denver, CO 80225-0287

contact-details

Phone Number: Hanford: 509.376.1647 Voice

Email Address: mapr_information@nps.gov
Description:

Fees

Entrance Fees

Entrance Passes

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.

park designation:National Historical Park

Directions:

Manhattan Project National Historical Park is located in three states: New Mexico, Tennessee, and Washington. For more information on accessing each of these three units, visit our Directions & Transportation page.

For detailed directions, please visit this link.

Directions

Operating Hours:

Hanford Visitor Center

Access to the Hanford B Reactor is by tour only. Separate tours of the Historic Sites are also offered. For more information about tours of the B Reactor, visit http://manhattanprojectbreactor.hanford.gov/. For more information about tours of the historic sites, visit http://tours.hanford.gov/HistoricTours/.

Los Alamos Visitor Center

While there is currently no public access to the Department of Energy facilities in Los Alamos, walking tours are available in the town of Los Alamos. The Los Alamos Visitor Center is open Friday through Monday, 10 am to 3 pm.

Oak Ridge Visitor Center

The Oak Ridge Visitor Center is located within the Children's Museum of Oak Ridge. Here you are able to speak with National Park Service rangers, watch a short film on the Manhattan Project, and get literature on Manhattan Project-related historic sites throughout Oak Ridge. Visitor Center services are limited on Sundays, but brochures, maps, and site films are available.

Exceptions:

Thanksgiving Day (November 27, 2025 - November 27, 2025)

Christmas Eve and Day (December 24, 2024 - December 25, 2024)

New Year's Eve and Day (December 31, 2024 - January 1, 2025)

Memorial Day (May 26, 2025 - May 26, 2025)

Independence Day (July 4, 2025 - July 4, 2025)

Labor Day (September 1, 2025 - September 1, 2025)

Weather Information:

The Manhattan Project National Historical Park has units in Hanford, WA, Los Alamos, NM, and Oak Ridge, TN. Check local weather conditions at each unit before you visit.