Exposed wiring of “The Gadget,” the nuclear device that exploded as part of Trinity, the first test of an atomic bomb. At the time of this photo, the device was being prepared for its detonation, which took place on July 16, 1945. #

Jumbo, a 200-ton steel canister designed to recover the plutonium used in the Trinity test in the event that the explosives used were unable to trigger a chain reaction. In the end, Jumbo wasn't used for recovery, but was placed near ground zero to help gauge the effects of the blast. It survived intact, but its support tower did not. #

U.S. military observers watch the explosion during Operation Crossroads Baker, a nuclear test conducted on Bikini Atoll on July 25, 1946. This was the fifth nuclear explosion ever, after two other tests and the two bombs dropped on Hiroshima and Nagasaki. #

A massive column of water rises from the sea as the U.S. detonates an atomic bomb at Bikini Atoll in the Pacific in the first underwater test of the device, on July 25, 1946. The blast and the enormous wave of water that followed immediately overwhelmed several abandoned ships, which were part of the site's dummy fleet of former warships. #

A huge mushroom cloud rises above Bikini Atoll in the Marshall Islands on July 25, 1946, following an atomic test blast, part of the U.S. military's Operation Crossroads. The dark spots in the foreground are ships that were placed near the blast site to test what an atomic bomb would do to a fleet of warships. #

On November 16, 1952, a B-36H bomber dropped a nuclear bomb over a point north of Runit Island in the Enewetak atoll, resulting in a 500-kiloton explosion, as part of a test code-named Ivy. #

Operation Greenhouse took place in the spring of 1951, consisting of four explosions at the Pacific Proving Grounds in the Pacific Ocean. This photo is from the third test, George, on May 9, 1951: the first thermonuclear bomb test, yielding 225 kilotons. #

“Rope tricks” are seen in this image of a nuclear explosion taken less than one millisecond after detonation. During Operation Tumbler-Snapper in 1952, this nuclear test device was suspended 300 feet above the Nevada desert floor and anchored by mooring cables. As the ball of plasma expanded, the radiating energy superheated and vaporized the cables just ahead of the fireball, resulting in the “spike” effects. #

Mannequins that represent a typical American family will soon experience the fury of an atomic blast with the power of 40,000 tons of TNT at Yucca Flat, Nevada, on April, 24, 1955. The test is being conducted to determine the survival chances of an atomic attack. Visible through the window is the tower 4,700 feet away on which the detonation will occur. #

Complete destruction of House No. 1, located 3,500 feet from ground zero, by an atomic blast on March 17, 1953, at Yucca Flat at the Nevada Proving Grounds. The time from the first to last picture was 2.3 seconds. The camera was completely enclosed in a 2-inch lead sheath as a protection against radiation. The only source of light was that from the bomb. In Frame 1, the house is lit by the blast. By Frame 2 the radiating energy has set it on fire, and the remaining frames show the rapid disintegration of the house by the blast wave. #

(1 of 2) In Operation Doorstep, conducted during the larger Operation Upshot-Knothole nuclear bomb test, mannequins are seated at a table in the dining room of House No. 2, attending a “dinner party” thrown by Civil Defense officials who are testing the effects of an atomic explosion on houses and occupants on March 15, 1953. #

(2 of 2) After the blast, mannequins lie strewn about the room, their “dinner party” interrupted violently by an atomic blast on March 17, 1953. #

(1 of 2) Stretched on a bed, in an upstairs bedroom of House No. 2, is a mannequin ready to test the effects of an atomic explosion at the atomic proving grounds near Las Vegas, Nevada, March 15, 1953. Through the window a mile and a half away stands a 300-foot steel tower atop which the bomb will be detonated. The purpose of the test blast is to show Civil Defense officials what would happen in an American city if it were subjected to a atomic attack. #

(1 of 2) Mannequins representing a typical American family gathered in a living room are pictured on March 15, 1953 in House No. 2, awaiting an atomic test explosion on the Nevada Proving Grounds. #

Operation Upshot-Knothole Grable, a test carried out by the U.S. military in Nevada on May 25, 1953. A 280mm nuclear shell was fired 6 miles into the desert by the M65 Atomic Cannon, detonating in the air, about 500 feet above the ground, with a resulting 15-kiloton explosion. #

The flash of the exploding nuclear warhead of an air-to-air rocket is shown as a bright sun in the eastern sky at 7:30 a.m. on July 19, 1957 at Indian Springs Air Force Base, some 30 miles away from the point of detonation. A Scorpion, sister ship of the launching aircraft, is in the foreground. #

The tail section of a U.S. Navy blimp is shown with the Stokes cloud in the background at the Nevada Test Site on August 7, 1957. The blimp was in temporary free flight in excess of five miles from ground zero when it was collapsed by the shock wave from the blast. The airship was unmanned and was used in a military effects experiment. #

Shot during Operation Fishbowl Bluegill, this is an image of an explosion of a 400-kiloton nuclear bomb taking place in the atmosphere, 30 miles above the Pacific, as viewed from above in October 1962. #

Expanding rings surround a mushroom cloud during the Yeso test explosion, part of Operation Dominic, a series of over 100 nuclear test explosions in Nevada and the Pacific in 1962. #

Sedan Crater was formed when a 100-kiloton explosive buried under 635 feet of desert alluvium was fired at the Nevada Test Site on July 6, 1962, displacing 12 million tons of earth. The crater is 320 feet deep and 1,280 feet in diameter. #

A photo of a nuclear bomb detonated by the French government at the Moruroa atoll, French Polynesia. Original here. #

This “Survival Town” house, photographed recently, was built some 7,500 feet from a 29-kiloton nuclear detonation—it remained essentially intact. Survival Town consisted of houses, office buildings, fallout shelters, power systems, communications equipment, a radio broadcasting station, and trailer homes. The test, called Apple II, was fired on May 5, 1955. #