Caerphilly Castle built between 1268 and 1290 so it is a medieval castle in the town of Caerphilly South Wales. Gilbert de Clare as part of his campaign to control the Welsh constructed the castle.
Not having natural defenses in the landscape the river was used to form extensive artificial lakes which are considered to be “the most elaborate water defences in all Britain” it occupies around 30 acres and is the second largest castle in Britain. It is noted for having introduced the concentric design of castle defences to Britain.
Visiting at the end of October Halloween was set up in the castle.