Portmeirion is a tourist village in Gwynedd, North Wales. It was designed and built by Sir Clough Williams-Ellis between 1925 and 1975 in the style of an Italian village, and is now owned by a charitable trust. The village is located in the community of Penrhyndeudraeth, on the estuary of the River Dwyryd, 2 miles (3.2 km) south east of Porthmadog.

en.wikipedia.org/wiki/Portmeirion

PORTMEIRION North Wales. THE PRISIONER: The Village - Filming location

If you are sharp eyed it's possible to see this wall in the above video.