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Manhattan Project Sites on Laboratory Land

The properties below are within the Manhattan Project National Historical Park boundaries on land managed by the Department of Energy. These properties are not yet accessible to the public.
  • Pond Cabin exterior

    1. Pond Cabin

    Ashley Pond built this cabin in 1914 as an office for the Pajarito Club, a private hunting ranch.

  • Pond Cabin with Jeep

    1. Pond Cabin

    During the Manhattan Project, the cabin was used by physicist Emilio Segrè’s group to support plutonium chemistry research.

  • Battleship Bunker

    2.Battleship Bunker

    This bunker built in 1944 is known as a battleship building because the bunker’s west end is bow shaped and shielded with a steel plate.

  • Implosion diagnostic test for Fat Man

    2.Battleship Bunker

    This bunker supported implosion diagnostic tests for Fat Man. The Creutz implosion test was the final check of the gadget prior to the Trinity test.

  • Slotin Building

    3. Slotin Building

    Constructed in 1946, this building supported criticality research.

  • Mockup of Slotin accident

    3. Slotin Building

    On May 21, 1946, a criticality accident occurred here during an experiment known as “tickling the dragon’s tail” that led to the death of scientist Louis Slotin.

  • Gun Site

    4. Gun Site

    During World War II, scientists at Gun Site conducted tests for the gun-assembled weapon designs known as Thin Man and Little Boy.

  • Gun Site

    4. Gun Site

    Components of Little Boy were assembled here before shipment to the Pacific.

  • V-Site

    5. V-Site

    In 1944 this site supported the first assembly work related to the Fat Man weapon design.

  • V-Site

    5. V-Site

    In July 1945, V-Site was also used to assemble the high-explosives sphere for the Trinity device, known as the Gadget.

The History & Legacy of the Manhattan Project at Los Alamos

Historic Manhattan Project Sites at Los Alamos
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Historic Manhattan Project Sites at Los Alamos National Laboratory

These sites, currently not accessible to the public, represent the world-changing history of the Manhattan Project at Los Alamos. Their preservation and interpretation will show visitors the scientific, social, political, and cultural stories of the men and women who ushered in the atomic age. Though the park was established in December 2015, full implementation will take time. At Los Alamos National Laboratory, the Department of Energy is developing phased access to its properties in step with performing its ongoing mission.

Map of Manhattan Project sites on laboratory land

Manhattan Project National Historic Park map of LANL sites