Any picture can speak 1,000 words, but only a select few say something poignant enough to galvanize an entire society. The following photographs screamed so loudly that the entire world stopped to take notice.

1. The Photograph That Raised the Photojournalistic Stakes:
"Omaha Beach, Normandy, France"
Robert Capa, 1944

"If your pictures aren’t good enough," war photographer Robert Capa used to say, "you aren’t close enough." Words to die by, yes, but the man knew of what he spoke. After all, his most memorable shots were taken on the morning of D-Day, June 6, 1944, when he landed alongside the first waves of infantry at Omaha Beach.

Caught under heavy fire, Capa dove for what little cover he could find, then shot all the film in his camera, and got out - just barely. He escaped with his life, but not much else. Of the four rolls of film Capa took of the horrific D-Day battle, all but 11 exposures were ruined by an overeager lab assistant, who melted the film in his rush to develop it. (He was trying to meet the deadline for the next issue of Life magazine.)

In an ironic twist, however, that same mistake gave the few surviving exposures their famously surreal look ("slightly out of focus," Life incorrectly explained upon printing them). More than 50 years later, director Steven Spielberg would go to great lengths to reproduce the look of that "error" for his harrowing D-Day landing sequence in "Saving Private Ryan," even stripping the coating from his camera lenses to echo Capa’s notorious shots.

2. The Photograph That Gave a Face to the Great Depression
"Migrant Mother"
Dorothea Lange, 1936

As era-defining photographs go, "Migrant Mother" pretty much takes the cake. For many, Florence Owens Thompson is the face of the Great Depression, thanks to legendary shutterbug Dorothea Lange. Lange captured the image while visiting a dusty California pea-pickers’ camp in February 1936, and in doing so, captured the resilience of a proud nation facing desperate times.

Unbelievably, Thompson’s story is as compelling as her portrait. Just 32 years old when Lange approached her ("as if drawn by a magnet," Lange said). Thompson was a mother of seven who’d lost her husband to tuberculosis. Stranded at a migratory labor farm in Nipomo, Calif. her family sustained themselves on birds killed by her kids and vegetables taken from a nearby field - as meager a living as any earned by the other 2,500 workers there. The photo’s impact was staggering. Reproduced in newspapers everywhere, Thompson’s haunted face triggered an immediate public outcry, quickly prompting politicos from the federal Resettlement Administration to send food and supplies. Sadly, however, Thompson and her family had already moved on, receiving nary a wedge of government cheese for their high-profile misery. In fact, no one knew the identity of the photographed woman until Thompson revealed herself years later in a 1976 newspaper article.

3. The Photograph That Brought the Battlefield Home
"Federal Dead on the Field of Battle of First Day, Gettysburg, Pennsylvania"
Mathew Brady, 1863

As one of the world’s first war photographers, Mathew Brady didn’t start
out having as action-packed a career as you might think. A successful daguerreotypist and a distinguished gentleman, Brady was known for his portraits of notable people such as Abraham Lincoln and Robert E. Lee. In other words, he was hardly a photojournalist in the trenches.

In fact, Brady had everything to lose by making a career move - his money, his business, and quite possibly his life. Nevertheless, he decided to risk it all and follow the Union Army into battle with his camera, saying, "A spirit in my feet said, ‘Go!’" And go he did - at least until he got a good look at the pointy end of a Confederate bayonet.

After narrowly escaping capture at the first Battle of Bull Run, Brady’s chatty feet quieted down a bit, and he began sending assistants in his place. In the span of only a few years, Brady and his team shot more than 7,000 photographs - an astounding number when you consider that developing a single plate required a horse-drawn-wagon-full of cumbersome equipment and noxious chemicals. Not exactly what you’d call "point-and-shoot."

Tethered as he was to his equine-powered darkroom and with film speeds being much slower then, Brady produced war photos that are understandably light on the action and heavy on the aftermath. Still, they mark the first time Americans were so immediately confronted with the grim realities of the battlefield.

4. The Photograph That Ended a War But Ruined a Life
"Murder of a Vietcong by Saigon Police Chief"
Eddie Adams, 1968

"Still photographs are the most powerful weapon in the world," AP photojournalist Eddie Adams once wrote. A fitting quote for Adams, because his 1968 photograph of an officer shooting a handcuffed prisoner in the head at point-blank range not only earned him a Pulitzer Prize in 1969, but also went a long way toward souring Americans’ attitudes about the Vietnam War.

For all the image’s political impact, though, the situation wasn’t as black-and-white as it’s rendered. What Adams’ photograph doesn’t reveal is that the man being shot was the captain of a Vietcong "revenge squad" that had executed dozens of unarmed civilians earlier the same day. Regardless, it instantly became an icon of the war’s savagery and made the official pulling the trigger - General Nguyen Ngoc Loan - its iconic villain.

Sadly, the photograph’s legacy would haunt Loan for the rest of his life. Following the war, he was reviled where ever he went. After an Australian VA hospital refused to treat him, he was transferred to the United States, where he was met with a massive (though unsuccessful) campaign to deport him. He eventually settled in Virginia and opened a restaurant but was forced to close it down as soon as his past caught up with him. Vandals scrawled "we know who you are" on his walls, and business dried up.

Adams felt so bad for Loan that he apologized for having taken the photo at all, admitting, "The general killed the Vietcong; I killed the general with my camera."

5. The Photograph That Isn’t as Romantic as You Might Think
"V-J Day, Times Square, 1945", a.k.a. "The Kiss"
Alfred Eisenstaedt, 1945

On August 14, 1945, the news of Japan’s surrender was announced in the United States, signaling the end of World War II. Riotous celebrations erupted in the streets, but perhaps none were more relieved than those in uniform. Although many of them had recently returned from victory in
Europe, they faced the prospect of having to ship out yet again, this time to the bloody Pacific.

Among the overjoyed masses gathered in Times Square that day was one of the most talented photojournalists of the 20th century, a German immigrant named Alfred Eisenstaedt. While snapping pictures of the celebration, he spotted a sailor "running along the street grabbing any and every girl in sight." He later explained that, "whether she was a grandmother, stout, thin, old, didn’t make any difference."

Of course, a photo of the sailor planting a wet one on a senior citizen wouldn’t have made the cover of Life, but when he locked lips with an attractive nurse, the image was circulated in newspapers across the country. Needless to say, "V-J Day" didn’t capture a highly anticipated embrace by long-lost lovers, but it also wasn’t staged, as many critics have claimed. In any case, the image remains an enduring symbol of America’s exuberance at the end of a long struggle.

6. The Photograph That Destroyed an Industry
"Hindenburg"
Murray Becker, 1937

Forget the Titanic, the Lusitania, and the comparatively unphotogenic accident at Chernobyl. Thanks to the power of images, the explosion of the Hindenburg on May 6, 1937, claims the dubious honor of being the quintessential disaster of the 20th century.

In the grand scheme of things, however, the Hindenburg wasn’t all that disastrous. Of the 97 people aboard, a surprising 62 survived. (in fact, it wasn’t even the worst Zeppelin crash of the 20th century. Just four years earlier, the U.S.S. Akron had crashed into the Atlantic killing more than twice as many people.) But when calculating the epic status of a catastrophe, terrifying photographs and quotable quotes ("Oh, the humanity!") far outweigh body counts.

Assembled as part of a massive PR campaign by the Hindenburg’s parent company in Germany, no fewer than 22 photographers, reporters, and newsreel cameramen were on the scene in Lakehurst, N.J. when the airship went down. Worldwide publicity of the well-documented disaster shattered the public’s faith in Zeppelins, which were, at the time, considered the safest mode of air travel available.

During the 1920s and 1930s, Zeppelins had operated regular flights, totting civilians back and forth between Germany and the Americas. But all of that stopped in 1937. The incident effectively killed the use of dirigibles as a commercially viable mode of passenger transport, ending the golden age of the airship not with a whimper, but with a horrific bang that was photographed and then syndicated around the globe.

7. The Photograph That Saved the Planet
"The Tetons - Snake River"