Written By: Lily Rothman, Liz Ronk

Across the world, in nations from China to Cuba, this Thursday, June 1, will mark what’s now widely known as International Children’s Day. The purpose of such a day some other nations mark it at different times throughout the year and the U.N. has Universal Children’s Day in November is to both celebrate the lives of children and remember the importance of protecting them so that they can fulfill the boundless potential that comes with being young.

In honor of that day, LIFE takes a look back through its 37 years of iconic photography to find images that capture the breadth of experience of children around the world. Funny or serious, cute or moving, happy or sad, the kids shown here illustrate in their own ways an element that makes childhood uniquely special. They may be small, but their inner lives, as captured on film by LIFE’s expert photographers, are anything but.

Chinese-American children in San Francisco, 1936.

International Children’s Day

Alfred Eisenstaedt The LIFE Picture Collection/Getty Images

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International Children’s Day

Pictures Inc. The LIFE Picture Collection/Getty Images

Eskimo child in Canada, 1937.

International Children’s Day

Margaret Bourke-White The LIFE Picture Collection/Getty Images

A young Rumanian boy, 1938.

International Children’s Day

John Phillips The LIFE Picture Collection/Getty Images

Children in blitzed north of England, 1940.

International Children’s Day

Hans Wild The LIFE Picture Collection/Getty Images

Young boy in the Tungkwan area of China, 1941.

International Children’s Day

Carl Mydans The LIFE Picture Collection/Getty Images

A farmer's son holding a pair of Hampshire piglets on farm in Lancaster County, Pennsylvania, 1943.

International Children’s Day

Alfred Eisenstaedt The LIFE Picture Collection/Getty Images

Child actress Margaret O'Brien and her spaniel pet Maggie sharing a bubble bath, Los Angeles, Calif., 1944.

International Children’s Day

Marie Hansen The LIFE Picture Collection/Getty Images

Children having military parade in street in Tarrytown, N.Y., 1944.

International Children’s Day

Eliot Elisofon The LIFE Picture Collection/Getty Images

Three children graduating kindergarten in the U.S., 1945.

International Children’s Day

Nina Leen The LIFE Picture Collection/Getty Images

Austrian girl and her doll, 1946.

International Children’s Day

Nat Farbman The LIFE Picture Collection/Getty Images

Native American boy of the Chochiti tribe playing drum outside his home, Sante Fe, New Mexico in 1947.

International Children’s Day

W. Eugene Smith The LIFE Picture Collection/Getty Images

David Henseley, young child crippled by polio with both legs in braces, soliciting funds in public fund-raising driver for a new polio hospital. High Point, N.C., 1948.

International Children’s Day

Martha Holmes The LIFE Picture Collection/Getty Images

Four year old Flora and her sister Jacqueline Couch in Leslie Country, Kentucky, 1949.

International Children’s Day

Eliot Elisofon The LIFE Picture Collection/Getty Images

Three young boys eating a Red Cross meal in Arizona, 1950.

International Children’s Day

Ed Clark The LIFE Picture Collection/Getty Images

Koo Ri Kang, a Korean war orphan who would not smile in South Korea, 1951.

International Children’s Day

Michael Rougier The LIFE Picture Collection/Getty Images

Nine year old prodigy, Hansan Kaptan, Turkish child, has an exhibition at a gallery in Paris, France, 1951.

International Children’s Day

Gordon Parks The LIFE Picture Collection/Getty Images

Child standing beside a miniature horse, showing size comparison, Los Angeles, Calif., 1952.

International Children’s Day

Ed Clark The LIFE Picture Collection/Getty Images

A young Jamaican girl scout with surprised look as she watches the arrival of Queen Elizabeth II. Jamaica, 1953.

International Children’s Day

Cornell Capa The LIFE Picture Collection/Getty Images

Group of Boys Club little league baseball players putting on their uniforms while sitting in classroom, Manchester, NH, 1954.

International Children’s Day

Yale Joel The LIFE Picture Collection/Getty Images

Children hard at work at school in Iowa, 1954.

International Children’s Day

Gordon Parks The LIFE Picture Collection/Getty Images

A little girl looking at doll through a window, Westchester, NY, 1955.

International Children’s Day

Ralph Morse The LIFE Picture Collection/Getty Images

Laughing boy on street in Trastevere, Rome, 1958.

International Children’s Day

Carlo Bavagnoli The LIFE Images Collection/Getty Images

Little boys sleeping on a subway car in New York, NY, 1959.

International Children’s Day

Stan Wayman The LIFE Picture Collection/Getty Images

Sandra Kunhardt pretending she is a doll in the US, 1961.

International Children’s Day

George Silk The LIFE Picture Collection/Getty Images

A group of children in India, 1963.

International Children’s Day

Alfred Eisenstaedt The LIFE Picture Collection/Getty Images

PARIS

International Children’s Day

Alfred Eisenstaedt The LIFE Picture Collection/Getty Images

A young child in Vietnam, 1965.

International Children’s Day

Paul Schutzer The LIFE Picture Collection/Getty Images

Children in the Watts neighborhood of Los Angeles, Calif., 1966.

International Children’s Day

Bill Ray The LIFE Picture Collection/Getty Images

Children at a school in Lancaster County, Penn., photographed with a Polaroid SX-70 camera, 1972.

International Children’s Day

Co Rentmeester The LIFE Picture Collection/Getty Images

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