The Prisoner (1967 British TV Show) ?

[Yaddo42]

According to a book I've got, that "Secret Agent" episode which filmed at the resort town of Portmeirion, which also "portrayed" The Village in "The Prisoner", kind of eventually led to McGoohan's idea for "The Prisoner". He liked the architecture and atmosphere of the place and thought it should be used for a project. When he was preparing material to pitch the idea for "The Prisoner" to Lew Grade about two years later, he had photos of Portmeirion included.