NEWSPHOTOS: Trinity SiteA family poses before the obelisk marking the site and date of the first atomic bomb explosion. The obelisk at Trinity Site is at the center of the half-mile wide and eight-foot-deep blast crater.Bud Russo/For The Sun-NewsA volunteer at Trinity Site uses a Geiger counter to demonstrate low-level radiation in many common objects.Bud Russo/For The Sun-NewsRemnants of a bomb casing designed to contain the atomic bomb explosion in case it fizzled. A test with 100 tons of TNT blew both ends off. It was not used for the atomic blast.Bud Russo/For The Sun-NewsMcDonald Ranch, at Trinity Site, where the plutonium device was assembled.Bud Russo/For The Sun-NewsThe first atomic explosion, July 16, 1945 at Trinity Site.U.S. Department Of EnergyA timing control shelter, nearly six miles from bomb site, is where people, like Dr. Robert Oppenheimer, head of Los Alamos, observed the bomb detonation. The shelter no longer exists.U.S. Department Of EnergyThe “gadget ”— the plutonium-based bomb —sits with a scientist at the top of the tower at Trinity Site.U.S. Department Of EnergyVisitors to the Trinity Site will see the location where the world's first atomic bomb was detonated.CourtesyAn obelisk marking the historic site of an atomic bomb test east of San Antonio, N.M., is seen in April 2009.Diana Alba Soular8-year-old Josiah Fidel, from Albuquerque, New Mexico plays in the dirt next to the obelisk commemorating the first atomic bomb test at the Trinity Site at White Sands Missile Range in New Mexico as other visitors to the site take photographs on April 4th, 2015. The White Sands Missile Range opened the Trinity Site to the public for an open house commemorating the 70th anniversary of the first atomic test which took place there on July 16th, 1945. Several thousand visitors came to see the site, take photographs and learn more about the event.Jett Loe / Sun-NewsAn obelisk marking Trinity Site, where the first atomic bomb was explodedDiana Alba Soular -- Sun-News