I’m trying to remember two old film I saw in the lat 60 or early 70s:
One is an old B&W film about two kids and the only scene I remember is them being trapped in an old windmill after it catches fore being struck by lightning.
The second has a scene when a guy drives his red convertible sports car off an unfinished overpass and is decapitated. A lady in white starts dancing with his head.
Spirits of the Dead
1968. That is your second movie. Third segment, Fellini’s adaptation of Poe’s “Toby Dammit, or Never Bet the Devil Your Head”
http://www.imdb.com/title/tt0063715/?ref_=fn_al_tt_1