Manhattan Project (3:09)
Explore the top-secret American project to build the world's first atomic bomb.
Videos (17)
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Manhattan Project
Manhattan ProjectVideo Clip (3:09)
Video Clip (3:09)
Explore the top-secret American project to build the world's first atomic bomb.
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Secret Atomic City in Tennessee
Secret Atomic City in TennesseeVideo Clip (3:15)
Video Clip (3:15)
The K-25 plant in Oak Ridge, Tennessee, was built to enrich uranium for the atomic bomb.
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Coroner's Report: Atomic Bomb
Coroner's Report: Atomic BombVideo Clip (2:17)
Video Clip (2:17)
In August 1945, the United States dropped two atomic bombs over the Japanese cities of Hiroshima and Nagasaki. What happened to people on the fringes of the blasts?
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Einstein and the Atom Bomb
Einstein and the Atom BombVideo Clip (2:37)
Video Clip (2:37)
History takes a closer look at one of the greatest minds the world has ever seen. Find out what you have always wanted to know about Albert Einstein.
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Cold War
Cold WarVideo Clip (2:31)
Video Clip (2:31)
The Cold War is over, but what it left behind may surprise you.
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Atomic Bomb Assembled
Atomic Bomb AssembledVideo Clip (1:27)
Video Clip (1:27)
What did the world's first atomic bomb look like and how was it assembled? Watch actual footage of the bomb being prepared by U.S. engineers in 1945. From History Uncut.
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Cities of the Underworld: A-Bomb Underground
Cities of the Underworld: A-Bomb UndergroundVideo Clip (2:33)
Video Clip (2:33)
Check out a scene from the new season of Cities of the Underworld, only on The History Channel.
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K-25 Plant Produces Uranium
K-25 Plant Produces UraniumVideo Clip (3:25)
Video Clip (3:25)
During WWII the U.S. built a top secret nuclear processing plant called Y-12.
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Einstein: Regret
Einstein: RegretVideo Clip (3:18)
Video Clip (3:18)
History takes a closer look at one of the greatest minds the world has ever seen. Find out what you have always wanted to know about Albert Einstein.
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Rare Color Films Document Atomic Bomb
Rare Color Films Document Atomic BombVideo Clip (2:44)
Video Clip (2:44)
An in-depth look at the events surrounding the dropping of atomic bombs on Hiroshima and Nagasaki, and ultimately, Japan's surrender in World War II.
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Cities of the Underworld 3: A-Bomb: Geo Cites
Cities of the Underworld 3: A-Bomb: Geo CitesVideo Clip (2:17)
Video Clip (2:17)
Geo cites sit 180 feet beneath the surface of Tokyo to protect the city from the affects of a major earthquake.
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Cities of the Underworld 3: A-Bomb:Tunnels
Cities of the Underworld 3: A-Bomb:TunnelsVideo Clip (2:25)
Video Clip (2:25)
In late 1944, approximately 6,000 laborers were able to complete nearly 80% of an underground fortress designed to protect Emperor Hirohito.
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Cities of the Underworld 3: A-Bomb: G Cans
Cities of the Underworld 3: A-Bomb: G CansVideo Clip (2:34)
Video Clip (2:34)
Don Wildman explores the inner workings of the G-cans, Japan's answer to monsoon flooding.
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Atomic Test Explosions 1948
Atomic Test Explosions 1948Video Clip (1:36)
Video Clip (1:36)
Shots of a test nuclear explosion in Hawaii. | Courtesy of the Department of Energy Nevada Operations Office
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Einstein Letter Advocates Atomic Bomb
Einstein Letter Advocates Atomic BombVideo Clip (3:46)
Video Clip (3:46)
In this "10 Days" video, learn how with the stroke of a pen, Albert Einstein, one of the greatest physicists in history, changed the world. On July 16, 1939, Einstein signed a letter urging President Franklin D. Roosevelt to develop the atomic bomb.
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How Close was Hitler to the A-Bomb?
How Close was Hitler to the A-Bomb?Video Clip (3:45)
Video Clip (3:45)
How close was Hitler to launching a nuclear attack against the Allies in World War II? After developing a V2 ballistic missile capable of reaching as far a New York, Hitler made nuclear development his highest priority.
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Atoll Atomic Test Explosion
Atoll Atomic Test ExplosionVideo Clip (0:47)
Video Clip (0:47)
This atomic explosion History Channel video shows the ramifications of a nuclear test off of Hawaii. The shots are of a nuclear experiment done by the Department of Energy known as the DOE.
Photo Galleries (6)
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Hiroshima and Nagasaki
Hiroshima and Nagasaki(12 Photos)
12 Photos
See pictures from the bombings of Hiroshima and Nagasaki during World War II.
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Cold War: American Leaders
Cold War: American Leaders(13 Photos)
13 Photos
From 1945 until the fall of the Soviet Union in 1991, U.S. presidents and politicians developed strategies to limit the spread of communism.
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New Mexico
New Mexico(7 Photos)
7 Photos
History.com's state gallery for New Mexico. Learn more about the state symbols and famous landmarks.
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Harry S. Truman
Harry S. Truman(19 Photos)
19 Photos
See pictures from the life and presidency of Harry S. Truman.
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Franklin D. Roosevelt
Franklin D. Roosevelt(20 Photos)
20 Photos
See pictures from the life and presidency of Franklin D. Roosevelt.
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Axis Military Leaders
Axis Military Leaders(12 Photos)
12 Photos
View images of Axis military leaders from World War II.
Interactives (1)
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Inside WWII
Inside WWIIInteractive
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Read More about The Trinity Test
On July 16, 1945, scientists from the top-secret nuclear development program known as the Manhattan Project exploded the first atomic bomb at the Trinity test site at Alamogordo, New Mexico.
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