20th Century

Rachel Heyhoe Flint. (Photo by Reg Speller/Fox Photos/Getty Images)

100 women: Sport

Grace Hopper. (Photo by Bettmann/Getty Images)

100 women: Science & Technology

Rosa Parks. (Photo by Don Cravens/The LIFE Images Collection/Getty Images)

100 women: Politics, Revolutionaries & Activists

Jane Austen. (Photo by Universal History Archive/UIG via Getty Images)

100 women: Media & Culture

Margaret Thatcher. (Photo by Tim Graham/Getty Images)

100 women: Leaders & Royalty

PARIS, FRANCE - MARCH 29: Indian writer Amrita Pritam poses during portrait session held on March 29, 1983 in Paris, France. (Photo by Ulf Andersen/Getty Images)

100 women: Literature

Boudicca. (Photo by Hulton Archive/Getty Images)

100 women: Military

(Original Caption) 4/8/1931-Philadelphia, Pennsylvania-Amelia Earhart in the cockpit of her autogiro after setting a new altitude record for women in planes of this type. She failed, however, to break Elinor Smith's record of 27,418 feet in a non-windmill type plane.

100 women: Exploration & Adventure

CIRCA 1840: An Alfred Edward Chalon watercolor of Augusta Ada King-Noel, Countess of Lovelace (nee Ada Byron) daughter of Lord Byron circa 1940. (Photo by Donaldson Collection/Michael Ochs Archives/Getty Images)

100 women: Business & Economics

Fern Riddell.

Fern Riddell

Henry Hemming.

Henry Hemming

Sanjay Bhattacharya.

Sanjoy Bhattacharya

British soldier, explorer and big game hunter Frederick Selous, pictured in 1914. (Photo by Topical Press Agency/Hulton Archive/Getty Images)

The hunter who became a naturalist

The Alfred Jewel: gold, rock, crystal and enamel

Objects of affection

Sunbathers enjoy some fun and games at a tennis court near a lido at Castle Mill, Cheshire, August 1936

The 1930s: When the future looked bright