I only just discovered this. I am a female Freemason - women can also be Freemasons. There are several women's only orders in Britain and two that are for both men and women and one for men only.
The aim of Freemasonry is to provide an environment for like-minded people to connect, work on their own personal and spiritual development (in its broadest meaning) to become 'better' people. Better in terms of more open-minded, tolerant and generous in both behaviour and spirit.
It has and still provides me with a wonderful way to do that and I know I am so much more open-minded now than I was before I joined 20+ years ago.