Built: Late 11th Century Location: Caernarfon, Gwynedd, North-West Wales History: While the castle was under construction, town walls were built around Caernarfon. The work cost between £20,000 and £25,000 from the start until the end of work in 1330. Despite Caernarfon Castle's external appearance of being mostly complete, the interior buildings no longer survive and many of the building plans… Continue reading Caernarfon Castle