Leonor Ferrer (Barcelona, 1874–1960) was a social and feminist activist and the first woman in Spain to obtain the title of draftsman (1905). For thirty-three years, she worked in Barcelona as the head draftsman for several telephone companies, defying gender norms with brilliance and determination. She left behind a personal archive that reflects her activism in education, women’s emancipation, and the presence of women in all areas of society. She was also an active map collector. In 1922, she embarked on a very unique initiative: the creation of a personal map library with an international scope. Leonor Ferrer’s legacy can be explored through the personal archive she compiled. In 2009, her family donated it to the Map Library of the Cartographic and Geological Institute of Catalonia, located less than 350 meters from her now-demolished birthplace in the Poble-sec neighbourhood of Barcelona. A fierce champion for women’s rights, she believed, “La educación es la llave que abre todas las puertas” (“Education is the key that opens all doors”). Her legacy continues to inspire us to pursue knowledge fearlessly and challenge societal boundaries.