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 Site.
Map showing location of park.
10 adults wearing helmets on bikes ride along a paved path lined with trees.
Local Organizations to Host Ride with a Ranger Program May 2025
Manhattan Project National Historical Park is partnering with Bike Tri-Cities and the REACH Museum to host Ride with a Ranger program on Saturday, May 3 at 9:30 am.
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