In 1967, Kathrine Switzer made her mark in Boston Marathon history by becoming the first woman to run the race with an official bib. Along with Roberta "Bobbi" Gibb, who was the first woman to run the marathon (without an official bib), Switzer helped usher in the era of women's participation in the Boston Marathon. In the 50 years since Switzer first ran, more than 176,000 women have completed the marathon. Watch the video above to see some of what they've accomplished.