Just in time for Halloween, I found this film via Coilhouse. It's called "Häxan" and is a documentary about the belief in witchcraft, about superstition and mass-hysteria, from 1922. You can find the full-length film here.
It's a Swedish-Danish cooperation and one of the most expensive films produced in Scandinavia at that time. The film was banned in the U.S. and heavily censored in many countries because of violence, nudity and sexual depravity. Häxan is full of historical and social details and, on the other side, a visual and artistic gem. Have fun!