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 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

National Geographic Magazine editor, Gilbert H. Grosvenor at work at the National Geographic Headquarters in Washington D.C., 1914.Photograph by Leet Brothers, National Geographic Creative

National Geographic Magazine editor, Gilbert H. Grosvenor at work at the National Geographic Headquarters in Washington D.C., 1914.Photograph by Leet Brothers, National Geographic Creative

Newspaper boys cool off in a New York City park fountain, April 1916.Photograph by Edwin Levick, National Geographic Creative

Newspaper boys cool off in a New York City park fountain, April 1916.Photograph by Edwin Levick, National Geographic Creative

Men inspect a British airplane with folding wings, 1918.No Credit Given

Men inspect a British airplane with folding wings, 1918.
No Credit Given

French opera star Marthe Chenal sings Marseillaise during World War I in Alsace, France, November 1917.Photograph by Harriet Chalmers Adams, National Geographic

French opera star Marthe Chenal sings Marseillaise during World War I in Alsace, France, November 1917.Photograph by Harriet Chalmers Adams, National Geographic

A wrecked Zeppelin sits ashore in Mison, France, 1918.Photograph by Paul Thompson, National Geographic

A wrecked Zeppelin sits ashore in Mison, France, 1918.Photograph by Paul Thompson, National Geographic

Men observe the giant statues of Easter Island in Polynesia, December 1922.Photograph by J. P. Ault, National Geographic

Men observe the giant statues of Easter Island in Polynesia, December 1922.Photograph by J. P. Ault, National Geographic

A woman on a farmer’s shoulder emphasizes a corn crop’s height in Minnesota, 1916.Photograph by A. W. Thompson, National Geographic

A woman on a farmer’s shoulder emphasizes a corn crop’s height in Minnesota, 1916.Photograph by A. W. Thompson, National Geographic

A welder works on cowls for liberty ships in California, 1942.Photograph by Acme News Pictures, Inc.

A welder works on cowls for liberty ships in California, 1942.Photograph by Acme News Pictures, Inc.

Alexander Graham Bell and his wife Mabel hold hands at the water’s edge in Nova Scotia in 1898.Bell Collection

Alexander Graham Bell and his wife Mabel hold hands at the water’s edge in Nova Scotia in 1898.
Bell Collection

A shielded dummy in a basement for atomic bomb testing in Nevada, March 1953.Photograph by Volkmar Wentzel, National Geographic

A shielded dummy in a basement for atomic bomb testing in Nevada, March 1953.Photograph by Volkmar Wentzel, National Geographic

The Agawam prepares to launch from the Submarine Boat Corporation dry dock in Newark, New Jersey, September 1918.Photograph by M. Rosenfeld, National Geographic

The Agawam prepares to launch from the Submarine Boat Corporation dry dock in Newark, New Jersey, September 1918.Photograph by M. Rosenfeld, National Geographic

Poor french children in a hospital ward, November 1918.Photograph by H. C. Ellis, National Geographic

Poor french children in a hospital ward, November 1918.Photograph by H. C. Ellis, National Geographic

A man balances a piece of pumice rock on his legs in Katmai National Park and Preserve, Alaska, September 1921.Photograph by Lucius G. Folsom, National Geographic

A man balances a piece of pumice rock on his legs in Katmai National Park and Preserve, Alaska, September 1921.Photograph by Lucius G. Folsom, National Geographic