Canvas Print of Caerphilly Castle photographed on a January morning in bright sunshine. This huge fortress was built by Richard de Clare in the 13th Century. It is apparently the second largest castle in the UK, second only to Windsor Castle. Caerphilly Castle arranges light shows and other family events to show and tell its history because this interest keeps the story of the Castle alive. A very popular location with visitors because of both its size and interests. The castle is also surrounded by a moat, usually full of ducks, gulls and swans.