US magazine National Geographic says its past coverage of people around the world was racist.
It ignored non-white Americans and showed different groups as exotic or savage, propagating "every type of cliché", editor Susan Goldberg said.
The magazine's April edition is dedicated to race and it has asked a historian to look at past issues.
It decided to re-examine its coverage to mark 50 years since civil rights leader Martin Luther King was murdered.
"Let's confront today's shameful use of racism as a political strategy and prove we are better than this,"Ms Goldberg wrote in an editorial entitled "For Decades, Our Coverage Was Racist".
Ms Goldberg said some of the magazine's archive material left her "speechless", including a 1916 photo of Australian Aborigines with the caption "South Australian Blackfellows: These savages rank lowest in intelligence of all human beings".