The Castles and Town Walls of King Edward in Gwynedd is a World Heritage Site recognised by UNESCO. It is located in Gwynedd, Wales. The site includes the castles of Beaumaris and Harlech. It also includes the castles and town walls of Caernarfon and Conwy. It is considered to be the "finest examples of late 13th century and early 14th century military architecture in Europe".