Caerphilly Castle – Located in the center of the town of Caerphilly in south Wales, United Kingdom. It is one of the great Medieval Castles of Western Europe. It is the biggest castle in Wales and the 2nd largest in Britain after Windsor Castle. Caerphilly is strange in being a late castle built on a virgin site. The Castle is a double-skinned parallelogram bordered by large-scale water defences. The concentric planning was more flexible. It gave fast access to any part of the castle by mural passages and wall-walks, towers and gatehouses could be self-sufficiently held. Caerphilly Castle is famous for its ‘leaning tower’. It’s Impressive great hall, nowadays used for various functions.