Beaumaris Castle. The history of this steadfast castle dates back to the thirteenth century. It was the last of the castles built by King Edward I. The castle was designed to be the first line of defense, as its outer wall contains about 300 rooms for archers, and in the ocean the earth was excavated and constructed A moat, and although it will not be completely built, as the year's towers did not reach the required height, it is one of the best historical castles in the city, which is visited by tourists who love history, especially the medieval era.