Manhattan Project National Historical Park • NM,WA,TN

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

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

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

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

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

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

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

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.

J. Robert Oppenheimer and Gen. Leslie Groves at the Trinity Test Site.
Los Alamos National Laboratory

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

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

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

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

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

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

Multistory industrial grey concrete building with tall exhaust stack surrounded by paved lot

Visit Hanford, Washington

Discover a secret factory that made plutonium.

A white building with a big sign that reads, "Los Alamos Project Main Gate"

Visit Los Alamos, New Mexico

Learn about a covert lab that built the atomic bombs.

Small white chapel with a tall steeple on a grassy hill with trees behind it on a sunny day

Visit Oak Ridge, Tennessee

Explore a hidden complex that enriched uranium.

A black and white photo of a group of men looking down at the ground.

What is the Manhattan Project?

Explore the history of the Manhattan Project via its people, places, culture, and events.

A group of people stand around a woman who is gesturing towards the gray wall of a building.

Join a Ranger Program in Hanford

Join rangers for a variety of fun and informative programs suitable for all ages.

People gather outside a window.

Tour Behind the Fence in Los Alamos

Learn about the US Department of Energy's guided tours of buildings behind the fence.

Several people seated on a bus while a guide stands speaking at the front of the bus.

Tour Behind the Fence in Oak Ridge

Register for a guided bus tour behind the fence in Oak Ridge, TN with the US Department of Energy.

Last updated: June 18, 2025

Contact Info

Mailing Address:

National Park Service, Manhattan Project National Historical Park
c/o NPS Intermountain Regional Office
One Denver Federal Center, Building 50
Denver, CO 80225-0287

Phone:

Hanford: 509.376.1647
Los Alamos: 505.661.6277
Oak Ridge: 865.482.1942

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