20th-century American explorers

Neil Alden Armstrong was an American astronaut and aeronautical engineer who, as the commander of the 1969 Apollo 11 mission, became the first person to walk on the Moon. He was also a naval aviator, test pilot and university professor.

Theodore Roosevelt Jr. was the 26th president of the United States from 1901 to 1909. Roosevelt was vice president for six months under William McKinley and became president after McKinley's assassination in 1901. He was 42 years old upon his first inauguration, making him the youngest person to hold the office.

Buzz Aldrin is an American former astronaut, aeronautical engineer, and fighter pilot. He was the second person to walk on the Moon after mission commander Neil Armstrong. He made three spacewalks as pilot of the 1966 Gemini 12 mission, and was the Lunar Module Eagle pilot on the 1969 Apollo 11 mission. Following the deaths of Armstrong in 2012 and pilot Michael Collins in 2021, he is the last surviving Apollo 11 crew member. Following Jim Lovell's death in 2025, Aldrin became the oldest living astronaut.

American astronaut, first American in space, lunar explorer (1923–1998)

explorer from the United States (1856–1920)

NASA astronaut, Naval aviator, aeronautical engineer, electrical engineer, fighter pilot, eleventh human to walk on the Moon (Apollo 10 and Apollo 17)

American astronaut and painter (1932-2018)

American astronaut and lunar explorer (1930–1999)

American naval officer, explorer (1888-1957)

American astronaut, naval officer, test pilot and aeronautical engineer (1930–2018)

American astronaut (1930-2016)

American engineer, retired U.S. Air Force officer, former test pilot, and former NASA astronaut (born 1932)

American astronaut (1930-1991)

American academic, explorer, treasure hunter and politician (1875–1956)

Astronaut, geologist, politician, 12th man to walk on the moon (Apollo 17)

American engineer, U.S. Air Force officer, test pilot, and NASA astronaut (born 1935)

American oceanographer

American explorer (1865-1940)

American explorer, naturalist, and writer (1884–1960)

American naturalist and explorer (1877–1962)

American aviator (1899–1956)

American explorer, botanist and photographer (1887-1972)

Austrian-American scientist-explorer (1884-1962)

American paleontologist and archeologist

American astronaut

Norwegian musher

American mesoamericanist (1857–1935)

American explorer, writer and photographer (1875-1937)

American writer (1945–2020)

American zoologist (1907–1976)

Newfoundland-American explorer

American explorer (1919–2009)

American explorer (1881–1955)

American botanist, pharmacist and explorer (1855-1940)

American explorer, author and archaeological historian (1908–1985)

American explorer and naturalist (1878–1966)

American explorer and sailor (1874-1970)

Explorer of Antarctica (1908–1992)

American botanist

American explorer (1908-1968)

American publisher, author, and explorer (1887-1950)

United States admiral (1903-1977)

American explorer and theologian (1927–2007)

American environmentalist (born 1944)

American geographer and explorer (1875–1956)

American biologist (1955-)

American adventurer (1924–2013)

American geologist

Underwater archeologist, discovered pirate ship Whydah

married filmmaking duo

American explorer and photographer

American sailor (1928-2017)

American photographer (1919–2007)

American environmental health scientist, explorer, conservationist, author

American cave explorer (1887–1925)

Scottish-American cartographer, surveyor, photographer and botanical collector

Whaler, Polar explorer

American photographer (1931–2021)

systems ecologist and engineer, metallurgist, adventurer and writer

American explorer (1897-1964)