Castell Caernarfon is a historic castle located in Caernarfon, Wales. Built by King Edward I in the late 13th century, it served as a royal residence and military stronghold. The castle is known for its impressive walls and towers, which are designed in a unique polygonal shape, making it a prime example of medieval military architecture. The castle is part of the Castles and Town Walls of King Edward in Gwynedd, a UNESCO World Heritage Site. Today, it attracts many visitors who come to explore its rich history and enjoy stunning views of the surrounding area, including the nearby Menai Strait.