Manhattan Project National Historical Park

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Several women sit on stools along a long hallway full of dials and meters.
The Calutron Girls worked at the Y-12 Electromagnetic Isotope Separation Plant in Oak Ridge during the Manhattan Project.
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.
A ranger is surrounded by visitors at a security gate, awaiting a ranger-led walk.
A Walk through Wheat is one of several accessible programs for the public to enjoy in Oak Ridge.
Photos: National Park Service

About Manhattan Project National Historical Park

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.

Plan a Visit

NPS DesignationNational Historical Park
Park State / Territory MembershipNew Mexico, Washington, Tennessee
Current Alerts0
Visitor Centers4
Campgrounds0
Things To Do56

Core visitor information on this page is sourced from the National Park Service. NPD proximity sections use NPS reference coordinates and straight-line distance. Local source bundle updated Sep 27, 2026. View the official NPS page.

Weather & Conditions

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.

NPS Reference Location

Park state / territory membership: New Mexico, Washington, Tennessee. This map uses the National Park Service reference coordinate. It may represent an administrative or reference point rather than a park entrance, trailhead, visitor center, or the nearest access point. Use the official NPS directions below when planning travel.

Operating Hours

The Hanford Visitor Center is open Monday - Friday 9:00 AM-4:00 PM. Access to the Hanford B Reactor is suspended due to major construction projects. To check for updates about these tours, visit http://manhattanprojectbreactor.hanford.gov/. Separate tours of the Historic Sites are offered beginning in May. For more information about these tours, visit http://tours.hanford.gov/HistoricTours/.

Friday9:00AM - 4:00PM
Monday9:00AM - 4:00PM
SaturdayClosed
SundayClosed
Thursday9:00AM - 4:00PM
Tuesday9:00AM - 4:00PM
Wednesday9:00AM - 4:00PM

Activities

Guided ToursJunior Ranger ProgramPark FilmMuseum Exhibits

Getting There

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.

View Official Directions

Contact & Address

The NPS-listed address may be an administrative office, visitor center, mailing/contact location, or other park facility rather than a park entrance.

NPS-Listed AddressNational Park Service, Manhattan Project National Historical Park, c/o NPS Intermountain Regional Office, Denver, CO, 80225-0287
PhoneHanford: 509.376.1647
Emailmapr_information@nps.gov

Topics & Themes

African American HeritageMilitaryScience, Technology and InnovationTragic EventsWars and ConflictsWorld War IIWomen's History

Things To Do

Hanford: Bike and Walk the Sacagawea Heritage Trail

Hanford: Bike and Walk the Sacagawea Heritage Trail

This recreational trail along the Columbia River is a perfect way to explore the Tri-Cities on foot and bike. Interpretive…

Hanford: Attend a B Reactor Tour

Hanford: Attend a B Reactor Tour

The US Department of Energy provides guided tours of the B Reactor. These tours provide a glimpse into the science…

Los Alamos: Tour Behind the Fence

Los Alamos: Tour Behind the Fence

Take a tour behind the fence of the Los Alamos National Laboratory.

Oak Ridge: Join a Ranger Program

Oak Ridge: Join a Ranger Program

Oak Ridge ranger programs are a great way to explore the remarkable history of the Manhattan Project. Follow the link…

Oak Ridge: Experience a Guided Tour Behind the Fence

Oak Ridge: Experience a Guided Tour Behind the Fence

Guided bus tours of Manhattan Project sites in Oak Ridge provide visitors an intimate behind-the-scenes glimpse of some of the…

Hanford: Visit the Museum at Keewaydin

Hanford: Visit the Museum at Keewaydin

Located in Kennewick's oldest park, the Museum at Keewaydin shares the history of east Benton County and communities that were…

More Things to Do

Additional activities and experiences from the National Park Service.

Hanford: Visit LIGO

The Laser Interferometer Gravitational-wave Observatory (LIGO) is a modern example of cutting-edge research that has ties to the Hanford Site. Built on…