MURDER MANSION 1973 (MILL CREEK)

A small group of people are stranded in an old house during a thick fog and find themselves attacked by the walking dead.
This film does actually work on the base level of haunted house films, but it is slow going at times and may not be for all tastes.
The cast does a good job with the material they have and the scenes of people being stalked by the corpses are very atmospheric and well done. Check it out if you're so inclined.