These unique, guided tours will take participants behind the fence on Los Alamos National Laboratory property, at the historic Pajarito Site, current-day Technical Area 18. Visitors will see the Pond Cabin, which served as an office for Emilio Segrè’s Radioactivity Group studying plutonium; a battleship bunker used to protect equipment and staff during implosion design explosives testing; and the Slotin Building, site of Louis Slotin’s criticality accident.

2024 Public Tour Dates

  • Tuesday, June 11
  • Wednesday, June 12
  • Thursday, June 13

*Registration for June 2024 tours opens May 1st at 11:00 am MDT. A link will appear on this page for registration.

  • Tuesday, October 22
  • Wednesday, October 23
  • Thursday, October 24

*Registration for October 2024 tours to be determined.



These exclusive, guided tours are only offered twice a year. Each tour lasts approximately 4 hours. There are 2 tours per day with a maximum of 30 people per tour.
Safety and security are vital at Los Alamos National Laboratory. Your eligibility to visit a national security site will be verified after you register.

To learn more about Manhattan Project history in the Los Alamos area, visit our Plan your visit page.

The most current information about the tours will always appear on this webpage. Please check back or bookmark this page for any updates.


Tour participants:

  • Must be U.S. citizens with original documentation, including an original birth certificate, passport, tribal identification, or other qualified document;
  • Must be at least 18 years of age;
  • Must be able to walk short distances, stand for 30 minutes, climb stairs, and traverse over uneven surfaces;
  • Must wear sturdy footwear and long pants;
  • Are not allowed to bring cell phones, cameras, Bluetooth devices, or recording devices of any kind onto the site;
  • Must follow all other requirements listed in the registration process.