1. 1964 | TANZANIA: A touching moment between primatologist and National Geographic grantee Jane Goodall and young chimpanzee Flint at Tanzania’s Gombe Stream Reserve.
2. 1963 | NEPAL: The first American team to summit Mount Everest in 1963 included National Geographic’s Barry Bishop.
3. 1995 | INDIA: By setting off a camera trap, a female tiger captures her own image in Bandhavgarh National Park.
4. 1935 | SOUTH DAKOTA, UNITED STATES: The National Geographic-Army Air Corps stratosphere balloon Explorer II prepares to rise.
5. 1938 | EGYPT: Three figures on camelback behold the pyramids of Giza.
6. 1991 | NORTH ATLANTIC: Rusted prow of the R.M.S. Titanic, which sank in the North Atlantic after hitting an iceberg in April 1912.
7. 1931 | AFGHANISTAN: In his favorite picture, legendary National Geographic photojournalist Maynard Owen Williams marveled.
8. 1984 | SOVIET UNION: Behind the Iron Curtain: Workers parade through Red Square on May Day.
9. COCOS ISLAND, COSTA RICA: Marine biologist and National Geographic Explorer-in-Residence Enric Sala dives with a green turtle.
10. 1909 | ALASKA, UNITED STATES: Washing his films in iceberg-choked seawater was an everyday chore for photographer Oscar D.