"Behind the fence" tours of the Manhattan Project National Historical Park in Los Alamos, New Mexico, will take place June 11-13, 2024. Registration for the free tours will begin May 1 at 11 a.m. MDT and is on a first-come, first-served basis with only 180 openings available. A link will appear on this page for registration.
These exclusive, four-hour tours take participants "behind the fence" at Los Alamos National Laboratory. Step inside the original Pond Cabin, where physicist Emilio Segrè’s team made the pivotal discovery that the Thin Man plutonium bomb design would not work. Descend into a bunker where experiments helped determine whether the Trinity nuclear test would succeed. See the Slotin Building, where a fatal criticality accident transformed the safety culture of Los Alamos National Laboratory.
Tour participants must be at least 18 years of age, U.S. citizens and able to provide proof of citizenship (such as a U.S. passport, birth certificate, or other document as listed on the event registration page) at tour check-in. Mobile phones and cameras are not allowed. As an active national security laboratory, Los Alamos National Laboratory has other entry requirements for visitors; these will be explained during the registration process.
These tours are not open to Laboratory employees.
Future tour opportunities, as well as ongoing park updates, will be posted on the Manhattan Project National Historical Park webpage. The tours are hosted by the Laboratory in collaboration with the Los Alamos Field Office of the Department of Energy’s National Nuclear Security Administration and the National Park Service.
Visit MAPR@LANL, the National Park Service’s Manhattan Project National Historical Park website and the Los Alamos History Museum for more information on the park.