I watched an interview earlier with the late great Patrick mcgoohan...he said hed made a previous tv series and had visited portmeirion one time and found it the most extraordinary place....I went there once as a kid and it is more than extraordinary its almost other wordly....its a place on the side of a mountain by the north wales beaches where some eccentric local multi millionaire decided to save abandoned buildings around the world and bring them back to the portmeirion village....the whole tv show didn't really need a set......you can stay there too, highly recommended
http://www.portmeirion-village.com/
as for pat mcgoohan, the interviewer asked him how would you like the show to be remembered in 1 line and mcgoohan said it his own strange inimitable way, "ill be seeing YOU"