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Trinity Site
Holloman Air Force Base Alamogordo, NM 88310
575-678-1134

The Trinity Site is where the first atomic bomb was tested. During an open house, patrons will see an obelisk at Ground Zero and the McDonald ranch house where the plutonium core was assembled. The sight is open twice a year on the first Saturday of April and October. Stallion gates open from 8 am to 2 pm. The Trinity Site closes at 3:30. Admission is free.