Dracula Versus Frankenstein (1970)

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The castles of Santa Barbara in Alicante and San Martín de Valdeiglesias, Madrid, contributed some authentic Transilvanianism, and the sand dunes at Cabo de Gata in Almeria also featured when Rennie flew off to Egypt to recruit the Mummy, who is about as frightening as mine.
At the Ermita de San Frutos, Sepúlveda, Segovia, built in 1100 AD and perched on an outcrop of rock above the River Duratón, the Werewolf and his blonde saviour-killer take a breather after escaping the clutches of the aliens, and then decide to go back to face their destiny.
According to neighbours of Sepúlveda, the castle of Castilnovo, ten kilometres south of the town portrayed the Monastery bought by alien Michael Rennie to carry out his dastardly experiments, experiments that lead one to wonder why it is that an alien civilisation capable of travelling 40,000 light years to conquer earth is unable to manufacture a decent TV screen!