The McDonald Ranch House in the Oscura Mountains of Socorro County, New Mexico, was the location of assembly of the world’s first nuclear weapon. The active components of the Trinity test “gadget”, a plutonium Fat Man-type bomb similar to that later dropped on Nagasaki, Japan, were assembled there on July 13, 1945. The completed bomb was winched up the test tower the following day and detonated on July 16, 1945, as the Trinity nuclear test.
The George McDonald Ranch House sits within an 85-by-85-foot (26 by 26 m) low stone wall. The house was built in 1913 by Franz Schmidt and is built of adobe, which was plastered and painted. The plutonium hemispheres for the pit of the Trinity nuclear test “gadget” (bomb) were delivered to the McDonald Ranch House on July 11, 1945. Text via Wikipedia.