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Manhattan Project National Historical Park Pond Cabin, built in 1914, is listed on the New Mexico State Register of Historic Places and is the only surviving log structure at the Laboratory dating to the Homestead period. (Photo: Los Alamos) Plans for America’s newest national park include admitting the public onto Laboratory property— without compromising national security or the Lab’s mission. In 1914, Detroit businessman Ashley Pond constructed a log cabin on the Pajarito Plateau in north-central New Mexico. The one-room structure served as the office for the Pajarito Club, a guest ranch for well-heeled city folk looking for a little Wild West adventure. Although the Pajarito Club was short-lived (it disbanded in 1916), Pond remained in the area and went on to found the Los Alamos Ranch School in 1917. The elite prep school offered classical education and rigorous outdoor activity for boys ages 12–18. But once more, Pond’s business venture was fleeting. In 1942, the U.S. government purchased the school and launched Project Y (now Los Alamos National Laboratory) of the Manhattan Project in its stead. You know the rest. But what about the cabin? Pond Cabin, as it’s now called, is not only still standing, but the approximately 400-square- foot structure has amassed quite a bit of history under its corrugated metal roof. During the Manhattan Project, Italian physicist and Nobel laureate Emilio Segrè used the cabin for 22 plutonium chemistry research that resulted in the surprising discovery that the Thin Man plutonium gun-type weapon design would never work. As a result, the wartime Laboratory was extensively reorganized to develop an alternative: the incredibly complex Fat Man plutonium implosion-type weapon. Today, Pond Cabin is one of nine Laboratory properties included in Manhattan Project National Historical Park (MPNHP), which was signed into law on November 10, 2015, and tells the story of America’s nuclear weapons science, technology, and industry during World War II. The Los Alamos site is one of three locations for the park—the National Park Service’s first multisite, multistate endeavor, which also includes key Manhattan Project facilities in Oak Ridge, Tennessee, and Hanford, Washington. In Oak Ridge, for example, park-goers can tour the X-10 Graphite Reactor that produced small quantities of plutonium; in Hanford, guests are bussed to the B Reactor, Los Alamos National Laboratory