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.

Constructing the B Reactor, the world's first full scale nuclear reactor, took hard work and ingenuity.

B Reactor Under Construction

The Calutron Girls worked at the Y-12 Electromagnetic Isotope Separation Plant in Oak Ridge during the Manhattan Project.

Calutron Girls at Y-12

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

Hanford B Reactor

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

Hanford Hike Through Time

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

Los Alamos Slotin Building

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

Los Alamos Ashley Pond Walk

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

Oak Ridge X-10 Control Panel

A Walk through Wheat is one of several accessible programs for the public to enjoy in Oak Ridge.

Manhattan Project National Historical Park

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