Beaumaris Castle
Built by the infamous Edward the First, this is one of the best preserved Medieval castles in the World. When Edward was trying to hold on to the territory he had won from the Welsh he decided to build a series of castles to protect his officials and troops. Beaumaris never became the powerful center of power that Edward expected mainly because he was soon off to more battles up North with the Scots. Because of his continued belligerence his treasury was unable to support both his armies and dreams of building fortifications across all of Britain.