Excerpt:
The Trinity Site -- where the first atomic bomb was exploded on July 16, 1945 -- is 110 miles south of Albuquerque between the Oscura mountains on the east and the San Mateo mountains on the west. It is about 60 miles northwest of Alamogordo. The site is open to the public twice a year -- on the first Saturday in April and the first Saturday in October. The site was also open an extra day on July 16, 1995, the 50th anniversary of the test.