File:Main Park Gate at Los Alamos.jpg

English: This building is a re-creation of the historic security gate all Manhattan Project workers passed through to enter Los Alamos. Before reaching the security gate, however, newcomers to Project Y had to go through Dorothy McKibbin. Known as the gatekeeper of Los Alamos, Dr. J. Robert Oppenheimer hired her as his assistant in Santa Fe, where she organized housing, greeted scientists, and, perhaps most importantly, issued security and identification passes to Project Y workers.      New arrivals to Los Alamos often had a hard time getting here. They stepped off the train in Lamy, New Mexico, and had to make their way to 109 East Palace Avenue in Santa Fe. Once they managed to find the nondescript, easily missed building, the new arrivals would meet McKibbin. She welcomed them to the project, typed up information cards for them, issued official IDs for passage through the guard gate, and sent them on an arduous two-hour journey to “the Hill.”