Movie from early 70s, possibly late 60s. A young couple, possibly newlyweds, drive to a hotel or maybe to a mansion in a small sports car , for what I think is their honeymoon. The driving scenes take place along a beautiful, rocky coastline I think. At the hotel, scary events take place--other people there (the hotel staff?) turn out to be a group of witches. After a bunch of scary happenings the couple are able to escape and they drive back home. The viewer is very relieved at this point! They arrive home, open the door, take a step in and turn the lights on...and the group of witches is there in the house (VERY scary music at this point). End of movie. I've tried Google, and IMDB, but can't find the name of this movie. Help me?