In 1967, the American athlete Kathrine Switzer, became the first woman to run the Boston Marathon.
At the time, athletics officials believed women were incapable of running more than a mile and a half.
After crossing the finishing line, Switzer was disqualified.
It was an experience that turned her into a campaigner for women's sport.
Picture: A Boston Marathon official attempts to stop Katherine Switzer, Credit: Associated Press
