Photo Courtesy LANL

MPNHP NEWS RELEASE

The next series of guided, behind-the-fence tours of Manhattan Project National Historical Park at Los Alamos National Laboratory will take place on May 5, 6, and 7. These unique, half-day tours take participants to places where Manhattan Project scientists made history. 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 test would succeed. See the Slotin Building, where a fatal criticality accident transformed the safety culture of the Lab, and hear from experts about what life was like in Los Alamos when it was a secret city.

These tours are offered by Los Alamos National Laboratory in collaboration with the National Nuclear Security Administration’s Los Alamos Field Office and the National Park Service. Reservations will be allocated via an online lottery system. Lottery registration opens on February 23 and closes on March 4. Tour guests will be selected and notified by the end of March.

Participants must be at least 18 years old, U.S. citizens and able to provide proof of citizenship at tour check-in. As an active national security laboratory, Los Alamos National Laboratory has strict entry requirements for visitors; please read registration materials carefully for details. These tours are not open to current LANL employees.

Lottery registration is online only. To register, visit https://ow.ly/JGil50Y7RBo. All future tour opportunities, as well as ongoing park updates, will be posted on the same page.

After the May 2026 tour series, more tours will be held in October 2026. A separate lottery will be held for these in July.