Inside one of the north turrets of Beaumaris castle, an unfinished 'concentric' symmetrical fort that dates way back to 1295 when its construction began as part of Edward I's campaign to conquer north Wales. He was hell-bent on conquering - so much so that he got distracted and started to invade Scotland and never managed to finish building it. Despite never fulfilling its original design, it's location overlooking the eastern entrance of the Menai Strait meant that it continued to hold significant strategic purpose, and it passed through the hands of the English and the Welsh many times over the centuries until peace finally came and it was declared a UNESCO world heritage site in 1986.