Monstrosity / City of the Dead (1963)

In Monstrosity (1963), a rich but unscrupulous old woman plots with a scientist to have her brain implanted in the skull of a sexy young woman. In The City of the Dead (1960), a young college student arrives in a sleepy Massachusetts town to research witchcraft; during her stay at an eerie inn, she discovers a startling secret about the town and it's inhabitants.