The shadow of an aircraft over the Saudi desert, November 1986.Photograph by Jodi Cobb, National Geographic Creative

The shadow of an aircraft over the Saudi desert, November 1986.Photograph by Jodi Cobb, National Geographic Creative

A Native American sends smoke signals in Montana, June 1909.Photograph by Dr. Joseph K. Dixon, National Geographic Creative

A Native American sends smoke signals in Montana, June 1909.Photograph by Dr. Joseph K. Dixon, National Geographic Creative

A farmer embraces his dog in his stonewalled field on Inishmore Island in Ireland, March 1971.Photograph by Winfield Parks, National Geographic Creative

A farmer embraces his dog in his stonewalled field on Inishmore Island in Ireland, March 1971.Photograph by Winfield Parks, National Geographic Creative

A quiet mosque in Palestine, 1926.Photograph by Jules Gervais Courtellemont, National Geographic Creative

A quiet mosque in Palestine, 1926.Photograph by Jules Gervais Courtellemont, National Geographic Creative

A boy sells lemonade from his front yard stand on Main Street in Aspen, Colorado, 1973.Photograph by Dick Durrance II, National Geographic Creative

A boy sells lemonade from his front yard stand on Main Street in Aspen, Colorado, 1973.Photograph by Dick Durrance II, National Geographic Creative

A kitten aboard a floating Victoria water lily pad in the Philippines, 1935.Photograph by Alfred T. Palmer, National Geographic Creative

A kitten aboard a floating Victoria water lily pad in the Philippines, 1935.Photograph by Alfred T. Palmer, National Geographic Creative

Characters in a pageant depict “Britannia” and her colonies and dependencies, 1928.Photograph by Clifton R. Adams, National Geographic Creative

Characters in a pageant depict “Britannia” and her colonies and dependencies, 1928.Photograph by Clifton R. Adams, National Geographic Creative

Women sit in a modern chic boutique in Casablanca, 1971.Photograph by Thomas J. Abercrombie, National Geographic Creative

Women sit in a modern chic boutique in Casablanca, 1971.Photograph by Thomas J. Abercrombie, National Geographic Creative

A British airman gives a signal to another friendly aircraft, 1918.Photograph by Central News Photo Service, National Geographic Creative

A British airman gives a signal to another friendly aircraft, 1918.Photograph by Central News Photo Service, National Geographic Creative

Children play in pool they have dug out of the sand on the beach in Le Havre, France, 1936.Photograph by W. Robert Moore, National Geographic Creative

Children play in pool they have dug out of the sand on the beach in Le Havre, France, 1936.Photograph by W. Robert Moore, National Geographic Creative

Victoria Falls in Zambia.Photograph by Walter Meayers Edwards, National Geographic Creative

Victoria Falls in Zambia.Photograph by Walter Meayers Edwards, National Geographic Creative

Welts, scars of beauty, pattern the entire back of a Nuba woman in Sudan, 1966.Photograph by Horst Luz, National Geographic Creative

Welts, scars of beauty, pattern the entire back of a Nuba woman in Sudan, 1966.Photograph by Horst Luz, National Geographic Creative

A women’s water ski team lifts skis while being towed at 23 mph on Darts Lake in New York, 1956.Photograph by Robert Sisson, National Geographic Creative

A women’s water ski team lifts skis while being towed at 23 mph on Darts Lake in New York, 1956.Photograph by Robert Sisson, National Geographic Creative

A long exposure reveals cannonballs’ paths in a battle reenactment near Charleston, South Carolina, April 1961.Photograph by Thomas J. Abercrombie, National Geographic Creative

A long exposure reveals cannonballs’ paths in a battle reenactment near Charleston, South Carolina, April 1961.Photograph by Thomas J. Abercrombie, National Geographic Creative

Pedestrians walk on bustling Dotombori Street in Osaka, Japan, March 1970.Photograph by Thomas J. Abercrombie, National Geographic Creative

Pedestrians walk on bustling Dotombori Street in Osaka, Japan, March 1970.Photograph by Thomas J. Abercrombie, National Geographic Creative