Trinity Site Monument ID: 3321 | This file appears in: The Trinity Site and the First Atomic Bomb A monument to the Trinity Site located in White Sands Missile Range erected in 1965. It was designated as a National Historic Landmark by the National Park Service in 1975. Photograph courtesy of and used with permission by the National Security Research Center at Los Alamos National Laboratory. Download Original File "Trinity Site Monument" appears in: The Trinity Site and the First Atomic Bomb