I remember an old black and white movie from 1940s/50s, where a girl arrives in a small town/village and stays in a b&b then get abducted by a witches coven and her boyfriend has to rescue here before she is sacrificed - WHAT THE HELL IS IT CALLED!!

Actually from the 60's but think you're looking for this:
The City of the Dead (1960) - IMDb (http://www.imdb.com/title/tt0053719/)